I agree, they are pretty much starting from zero now, it's not like they had some killer releases and this is the follow up, they had 30 odd years of not being a band in the middle and people have forgotten them. Sean and Phil can drive this wherever they want to but it's not the band that made Eternal Nightmare, it's a band made up of other players who all have their own fans and could be contributors.
I also don't think they give a shit that Bobby (or anyone else) has their own fans to bring along and possibly convert. Look at the early interviews where they announced Bobby as being in the band, he was announced like he was a fill in. I may be a little harsh on Sean and Phil maybe they are all besties and behind closed doors Bobby's told them he doesn't want to contribute, but it just seems to me that Phil and Sean think this band is The Phil and Sean Band playing Vio-lence songs.