Ian went to the bar, got Josh in his car (so I guess he wasn't too trashed) and made Josh promise him that he was going home and staying home. Josh promised, and that was that, only Josh went back out after while (another troubling thing...). In the press conference, he admitted lying to his teammate.
There appears to be a very deep bond between Ian & Josh, so I'm not expecting "damage", at least not now. I think all the organization and most (probably/hopefully) know what they're dealing with. And that includes Josh.
These current Rangers have, to this point, been one of the more tightly-knit teams in pro sports today. It's a big part of why I've gotten so into supporting them. This incident will just be another test, one which they will all survive and learn from. Hopefully.
And yes, at some point there will be more. That's just the nature of the beast.