The problem was developers and users decided they wanted amiga games to be like those on PC and the newer 3D consoles. An 030 card and RAM was expensive enough, and even that isn't upto much for 3D gaming.
What we should have had is 2D games refined beyond what we had seen before, rather than tons of blocky Doom clones. If you aimed at 1200 with say some fast RAM and a hard drive you could produce some great 2D games. Look at the Neo Geo, games such as Metal Slug took 2D gaming to new heights. Instead of jumping on the 3D bandwagon, devs should have played to the Amigas strengths and created great 2D games instead.