If Bethesda does come out with the bad news I seriously doubt it would be the end of them as some here have mentioned, yes they would get a massive caining from gaming in general but that may be just the kind of tonic that Bethesda needs in order to wake-up to themselves. It is a sad and long running joke about the buggyness of Beth. products and a good hard hammering in the media might just put an end to it, they might even start listening to their Beta testers.
Actually gaming in general will hardly care.
I know this situation svcks for those who like Skyrim and want the DLC's, and I empathize, it will hurt Beth's image on the PS3 but on a grander scale this is pretty much a non-issue for several reasons:
a) The DLC's are not what you bought. You bought a full game, which already had more content than the vast majority of AAA releases.
If I'm not mistaken, pre-release of the main game, the DLC's were not advertised or promised to ever be available (on any platform for that matter, assumptions are meaningless)
Hence any accusation of being deceived, duped, or of Beth being moneygrabbers for not providing a "full" product, is pointless. You don't have any right to these DLC's.
This is also why this issue isn't as big in the current press as some here think it is or prefer it'd be.(that and gaming press still being immature even after 2 decades, but that's a different discussion)
B ) Despite all the hubbub gamers make, they are hardly ever principal enough to make strong their threats. They've been shafted far worse by many other companies, from invasive (potentially damaging) DRM over regurgitated content to god awful, barely functioning ports; and yet most perpetrators are still around, quite often even being the big dogs in the pen (just look at EA and Activasion). (and gamers have failed to support companies who actually did things different)
Add to it, that while Beth's conduct in this affair is possibly unsavoury (depends on the exact issues they're having), they've also built a huge amount of good PR in the larger gaming community with their stance towards modding and the overall quality and quantity of their games.
C) there is also the very real possibility Beth isn't actually at fault. The PS3 does have a reputation of being hard to program for, several devs have stated this in the past. The Gamebryo/Creation engine (which are essentially the same damn thing despite marketing) is also quite old and there could be something in its core programming that doesn't mesh well with the PS3's architecture. I'm not even close to a programmer or coder so I can't judge the likelihood of it, but I can't dismiss it either.
Criticizing Skyrim itself for being buggy is certainly justified. Criticizing Beth's PR/marketing department in the whole DLC issue as well. But demanding the DLC isn't necessarily, at least not in a legal or entitled sense.