i think what makes Tech interesting (or maybe it is because i have been listening for so long) is that it seems like each album is a different period of music. Anghellic sounds different than AP, which sounds different than Everready, which sounds different from Killer, etc.
Then there is the time between his 'album periods'....collabo albums, samplers and promos, etc.
I think there is no way to say he has peaked or will be peaking....he will continue to make music and (hopefully) that music will continue to change as he changes. As he grows older, goes through different experiences, meets new people, etc.
I see the albums as a snapshot of his life at that moment....that will continue.
EDIT: Also, wanted to add....good topic post...its good to see someone not posting something OT, relevant, and it isnt just a link to an article or twitter post.