Well, in reality Scubapro is still producing parts compatible with my old 109s and 156s, dating back to the seventies and the eighties, respectively. And these parts are the same for the G250-G260.Bastards!
So I would not be worried of lack of parts for this line of regs, it is the series with longer production time, and the only one which has never been discontinued, they just evolved maintaining full compatibility with the past.