I don't have a lot of hope for this blowing over, or any of this being a lie, but I am done with this band if this is all true and Dean leaves. No Scott and no Dean. I think Rob was also a big part of this band, but it's just not enough left.
The alternative is Dean stays, and supporting the band means supporting a man who has beaten his wife nearly to death on multiple occasions. Rob's always been the principal songwriter... He could bring in Nick Maybury or Shawn Tubbs, and it would still sound like STP... At this point, I think that's the only way STP goes forward untarnished.
I'm not holding out hope on him being fired, though. Sounds like Rob was already aware of all of this, and did nothing to stop it. Besides, Johnny Depp's had similar accusations leveled against him, yet Rob has had no issue touring with him... Nor has Joe Perry, I might add.
Honestly, looking at what's happened with Depp, I think this will all blow over. STP will continue touring, Dean will say the accusations are false, Rob will make comments in support of Dean, and the major public will forget it all in a few weeks since STP is not really big news anyway. Or else maybe Dean admits to having a problem, goes to rehab, and when he comes back out everyone's already forgotten what happened because STP isn't really big news anyway. Whatever happens, I don't see a long term affect that can damage Dean's career.
What will be long term is me imagining Dean trying to drown a baby every time I listen to STP from now on. That will be hard to get over.