Almost a good idea...I just hate the idea of putting all my eggs into one basket. To clarify: if one channel goes ka-put, you lose the entire component for the term of repair. Not a problem if you keep spares on hand and/or can re-assign other power components as required.
My buddy, Ken, managed to smoke a brand-new Carvin amp a few gigs back. It wasn't a defective unit either just a pure & simple case of mis-adventure (he pushed it beyond its recommended limits). Either way, he fried it....complete with the magic smoke! Good thing he keeps a spare in his trunk.
"...210 lbs. of twisted steel and sex appeal..."