Nothing would surprise me, really. If they really did fire him, which I'm inclined to believe they didn't, then why write him off by getting into a limo with Johnny Ace? Because if he was indeed fired, then the whole text angle was clearly scrapped and the firing was their way of amicably writing him off TV. So then, you know, just have him be fired and leave, not get into a car with someone. Unless, of course, that was just planting something for Johnny Ace which, frankly, seems like a waste. That guy isn't worth anything to the audience as a solo backstage persona.
My best guess is they're just stringing this along and that Nash will return, probably at Night of Champions (they obviously don't let these angles simmer very long).
Honestly, I wouldn't be surprised if they realized they made a mistake and misused him from the beginning. The creative team couldn't have possibly been sitting around thinking the text thing was a good idea in hindsight. See, they wanted Nash back because of the name value, not because he can wrestle. But I think what might have happened is that they got lured in by the all-enticing "swerve", so they manufactured this whole texting story on the fly. But then, as the weeks when on, they realized it didn't hold much weight. Nash's character is way more interesting as the outsider, and in the span of two weeks they turned him from the invader who cost someone the WWE Championship to some big old dude signed to a contract (it was kind of cool when Nash came out without music, but almost as soon as he had the nWo theme and a video package, he was just this big dumb novelty act for nostalgia). They probably realized that they shouldn't have set it up so Nash was doing someone a favor by laying out Punk, but that he was doing it because he's Kevin Nash and he does whatever he wants. The whole texting thing was stupid, so they just tied it together real swiftly to brush it under the rug, but now they can effectively get a re-do: have Nash get fired, then have him show up again later as the outsider, the guy who was fired but comes back to wreck havoc anyway against not just the COO, but one of the top contenders to the WWE Championship.
But, really, I could see it going either way and wouldn't really be surprised. And probably not care, either, since if he were to return it seems almost inevitable there would be some sort of nWo copycat faction running around.