I don't know if Claudio and Travis will let him back in the band or not, but frankly, that's not what's important right now, he needs to get clean, whether he ever plays for Coheed again or not.
But honestly. I don't think he'll play for Coheed again. The charges he is facing are like Multi-year in jail type things. It just makes me sad, because he is such a nice dude, and Claudio and Travis have had to put up with so much of this. I honestly see them being at the end of their rope and just cutting ties with him, as depressing a thought as that may be.