I love some of the replys on here, they make me laugh. Some people don't care that they can carry 20 healing pots and use them all in one fight, while others think it should be limited to number you can carry or use at one time. I personally prefer the old D&D approach, such as in Balder's Gate II. Its been a long time since I played BDII, but if memory serves healing potions were not very plentiful in the world as loot, and they were expensive to buy. This made having a dedicated healer and one alternate healer in your party essential. Also, the healing potions only came in 2-3 varieties of strength, and the minor healing potions became useless at high levels for anyone but your mages/healers with really low HP pools. This did 4 things: 1) Any time you found potions as loot was special 2) You did not buy, hoard, and consume tons of healing pots as it was simply not easily done do to limited supply/price 3) Healing potions became your solution to extremely difficult/boss fights, and were not used for just any average monster clash 4) Healing spells were essential. Now then, I know that Skyrim is entirely different from the group RPGs like BGII, and that you can't expect to play one like the other. But my storage chest in my house in Whiterun has a stockpile of healing/mana/stamina pots that would make a BGII character cry with joy, the same as if he had just found 50,000 gold (gold was not available in the vast qauntities that Skyrim possesses either).
Seriously though, healing/mana/stamina potions are so plentiful the only reason to take Alchemy is if you want to make uber potions or if you just enjoy it. They make Restoration useless, unless you are RPing or just like to use it. Yes, Restoration does a few things other than heal such as turn undead/wards, but it is a minimal return on effort for those pursuing Restoration. I think that potions are so easy to come by in the game that you could never buy a single potion or use a single Resto heal spell and never run out of potions. I personally play as a mage, and use Resto to heal myself and my followers most of the time. I carry only a few heal/mana pots for emergencies, but can't seem to help myself when I see them laying around as loot. My OCD to pick up every potion I see has lead to quite the collection in my home, as I only sell off potions that I know I will NEVER have a use for. And so to the final point, I think that potions should be less plentiful as loot for 2 reasons: 1) This would make Alchemy more useful, since you could make more/better potions than you could find and 2) Restoration would be more useful since the likely hood of running out of potions would be much higher, meaning people would prefer Resto in non-emergencies and fall back on the potions for really tough fights.
Seriously though, healing/mana/stamina potions are so plentiful the only reason to take Alchemy is if you want to make uber potions or if you just enjoy it. They make Restoration useless, unless you are RPing or just like to use it. Yes, Restoration does a few things other than heal such as turn undead/wards, but it is a minimal return on effort for those pursuing Restoration. I think that potions are so easy to come by in the game that you could never buy a single potion or use a single Resto heal spell and never run out of potions. I personally play as a mage, and use Resto to heal myself and my followers most of the time. I carry only a few heal/mana pots for emergencies, but can't seem to help myself when I see them laying around as loot. My OCD to pick up every potion I see has lead to quite the collection in my home, as I only sell off potions that I know I will NEVER have a use for. And so to the final point, I think that potions should be less plentiful as loot for 2 reasons: 1) This would make Alchemy more useful, since you could make more/better potions than you could find and 2) Restoration would be more useful since the likely hood of running out of potions would be much higher, meaning people would prefer Resto in non-emergencies and fall back on the potions for really tough fights.
Edit: And anyone who says the potions weight is a balance is just lying to themselves. A good warrior character only really has trouble against a boss. You have a lot of problems if you are dying to a bandit at level 20! So ten potions of healing is more then enough to slug through any dungeon. All at the massive cost of 5-10 pounds. Or even better just load up on 100 pounds of healing potions during a dungeon crawl and drop them once you are done and go loot! What a joke. Alchemy has been broke since Morrowind. At least Obsidian tried to fix it in with hardcoe mode in Fallout New Vegas, That is saying something when Obsidian says it is too easy.