Well, as an instance of the Str-based DC, the stunning ability of a Deva is that...they're in the minority, but they're occasionally here or there. They exist.
And the increase to DC's isn't that significant if you control carefully what gets assigned to what ability score. I'm not thinking Con for Disintegration, I'm thinking Con for Cure Wounds, Dex for Dimension Door, Strength for Magic Fang sort of thing....
In other words, I very much like the concept of drawing Psionic power from the body and the mind, not just yer book smarts. Requiring a Dex of 12 to get Dimension Door was a good way to reflect that. The only problem with the original psion was that if you were focused, you would suck, because the advantage of the psion was versatility. If there is a list of 'generalist' powers that use some other mechanic than ability scores to determine DC (maybe spend PP to boost it? Have it be 1/4 psion level?), then you can still not suck, but still be able to use both your body and your mind to tap your psychic energy. It's one of the reasons, I think, that more brutish and physical creatures lacking in book smarts, awareness, or personality, can still make kick-butt psychics.
I think that nasty, brutish, savage psychics is a pretty nifty element of the psionics system, and I think it would really suck to loose that. A quick way to do that is to loose the correlation between physical ability scores and psionic powers, especially if you focus on Intelligence.
Of course, it's still possible to maintain this to an extent....I mean, we haven't seen the new psychic feats, and there's all sorts of potential there (supernatural abilities based off of physical ability scores may be easier to stomach as feats instead of powers).
It's just that the moment the village idiot becomes a useless psion is to loose some of the appeal of pionics to me. I don't need another spellcaster who uses Int, Wis, or Cha and almost nothing else. Having the physical ability scores be useful (without forcing MAD) is a key enjoyment of psions in my book.
The way the original psion failed in this was that versatility was their main asset, but this meant that to take advantage of that asset, they needed MAD. The revised psion could be much more easily focused in a lot of ways, but I don't think focusing them like Every Other Spellcaster In The World is a particularly interesting focus, if that's the route they take.