They kept the Amiga alive until production of a games console variety (the CD32). This was 1985 - 1994 = 9yrs?
Depends on what you mean by keeping it alive.. I really did not see them doing any developement at all, other than shrinking the a1000 to smaller form factor for the a500, a600 and such.. When the a3000 came out, the gfx chip wasnt even aga and the sound chip was still the same with 8bit sound and 4 channels while the pc was finally starting to get 16bit soundcards. Then once a4000 came out, it was actually kinda a step backwards since they cut the costs by dropping the superiour scsi interface in favor of ide and the aga gfx was a nice upgrade, but came far too late in reality. The even more odd part is that it lacked a cdrom, which was already common in the pc world...
The only reason why the Amiga lasted as long as it did, was because it was so ahead of its time when commodore bought it.
Commodore did have some nice enginers, but that dosent help when the management sucks.
Escom and Gateway 2000 didn't do a better job and both of them went down the pan.
Escom didnt really have the kind of budget that Commodore orginally had.. Gateway 2000 on the other hand had the money but only bought the Amiga for the name. :-(