No it cant I am saying it wouldn't really make sense to have 2 different forms of transportation, thats like having 2 different weapon systems, or having 2 different systems of magic, I just dont see a plausible reason why they would include it
That's one of the reasons I stated it should be optional... so that you don't get 2 different forms at the same time.
Here are my reasons, as I stated not so long ago, why I think it should be included:
1. I like realism. I feel that you should walk/run or use a horse to get somewhere in the wilderness. Between cities I want a transportation system because I believe it would be realistic for cities to have some kind of transportation, especially since there is trading.
2. I like exploring. You get to discover more while you travel. And since Skyrim looks pretty nice, it makes it even more interesting
3. You are often forced to travel, experience the environments a lot more. You also meet more people, etc.
4. When you travel to some place, it gets harder. A long journey actually feels like a long joruney. And when you arrive you feel like you've earned it.
A transportation system is also nice, because sometimes it does get a bit ... tiresome. I think a transportation system is more immersive than fast travel, because there's a more logical reason. You have to pay, find someone who can make the travel possible, etc... instead of just clicking on a location on the map and instantly get there.
The only illogical thing about a transportation system like Morrowind is that you still instantly get there once you find that person who make the travel possible and pay that person. Perhaps Bethesda can improve this a little more by actually seeing you being in a boat... traveling. And then, if you get tired of it, just press a certain button and the character would go to sleep and wake up at the final destination