It is probably because Dave already said he was going to killing off Megadeth as their weren't any original members left other than him.
You know, if Dave would suck it up and beg, maybe Dave E. would come back and then Megadeth could survive. BTW, don't get me wrong. I love Dave M's music but he really seems to piss off everyone he works with. It is time for him to get over the anger from his Metallica days and not be such an arse.
Even with all that, I hope somehow Megadeth will continue but I doubt it.
