That's an interesting thought. I'd leave Wood elves with the higher Dexterity bonus, but I could easily see High Elves being +2 Charisma, +1 Dexterity and Gray Elves (to bring them back into the equation from pre-4E) being +2 Int, +1 Dex.
I really think Wood Elves being +2 Charisma, +1 Dexterity and High Elves being +2 Charisma, +1 Intelligence really fits them better.
I don't really see Wood Elves doing acrobatics through the air, doing a lot of tumbling, being particularly good at thievery... I mean, generally speaking, outside of ranged attacks with a bow and stealth, what it is about High Elves that is particularly Dexterous.
In fact, while on that note, I am not even sure what part Dexterity plays in aiming with bows. Isn't perception far more important which is reliant on Wisdom?
Now, you could say that they live in the woods and get on with the wild life which shows high survival skills as well as keen senses (though that is covered) which also reflects Wisdom, but then... Goblins have all those things in the fluff, though stats never reflect it, and no one is volunteering them for high Wisdom.
As I said originally, if Elves were to be given stats to meet their fluff then they would get a bonus to all stats. They just would. But neither with Wood Elves nor High Elves does it strike me that their Dexterity has ever been their primary superhuman ability any more so than any of the other attributes despite it being the traditional stat that has always been raised for them.
Instead, it strikes me that the biggest superhuman ability Elves have is causing everyone else to be in awe of them and totally convinced of their superiority and perfection.... and add to this that it is the only race, the ONLY race in which no member of the race at any time has ever been described by damn near anyone as "ugly" and that in and of itself may well be the true single defining characteristic across all Elves, and I really do see Charisma being the primary ability score that should be boosted on any sort of Elf.