I have no doubt that Microsoft will work hard on the resolution issue. They will probably reach parity on that front eventually. That's too big of an issue to ignore, at least in terms of public perception.
The other side of the coin, however, is going to be how hard (or easy) it is to optimize for the PS4. The similarity of the architecture, both to PC and to one another, could mean that optimization is a process that is both quick and easy. "Lazy developers" is mostly a myth--time and money are usually the real factors. Well optimized releases for both the PS4 and XO should see the Playstation version with slightly improved performance and/or visuals.
That's only with games that are pushing the boundaries, though. A lot of games, probably most games, will occupy a middle-ground where they reach their best within the limits of the XO, so there are no more improvements to be found on the PS4 or PC.
