Probably not, seeing as how there's no money in it.
Well there never was any money in it, he collected them cause of his OCD, he never sold them or anything, he just had thousands in his basement.
He also knew setlists of by heart, they were saying on the chaos in motion DVD, one of them could say when was the last time we played 'x song', and he would straight away, for example, like new york 1996.
If you look at some of the releases on YTSEjam or some of the fanclub CD's, there are recordings from back when they were called majesty, there are various audition tapes for numerous singers, theres even a 'making of' of scenes form a memory, like out takes, synth tracks, alternate vocals. And on the Falling into infinity Demo's they had Metropolis part 2 as one song.
The guy was really dedicated to the band, which is why it baffles me he left.
I think also, it will be hard to replace him, not due to technical ability, as im sure there are hundreds of DT fanboys who have learned every song waiting to take his spot, but I had stage presence, and something of an ego, but in a good way. If you saw your average band live, the drummer is just sat at the back keeping time, but with Dream Theater, Mike was almost regarded in the way a lead vocalist would be regarded in any other band. And I think thats what will be hard to replace.