Big Fallout fan, but not a fan of the older games' gameplay... That... Makes sense... Not really, if you're a big Fallout fan you should love the older games' gameplay, not just the newer ones.
Just a minor nitpick on my part, if you say you are a Fallout fan then you should love the entire franchise, especially the older games.
This ^
Not to mention that th older games have locations dozens of miles if not more apart if not greater. If you were to cram them into a location the size of Fallout 3 and New vegas, it would be very stupid. As an example you could go from Klamith Oregon to San Francisco just by walking down a street.
The Highwayman in Fallout 2 wouldn't work. Not to mention that alot of content in Fallout and Fallout 2 would be removed because Bethesda, will not or can not have such content in their games. Put it this way, New Reno would be cut from the game. Would lose the ability to kill the kids, and much of the drug use and the signs of the damage it does would be removed.
The Character creation sytem, such as the Skills, Traits, Skill point system and perks will just be hacked to hell.
I am also sure that the writing, dialogue and the canon of those games would be re writen, and given that Bethesda has crappy writers it would just be a mess.
Leave the original Fallouts alone. If you are a true fan of those games you would leave them alone, IMO.