No offense meant, but there always will be excuses. Even if it will have G5 and DDR memory, there will be new excuses by then. For something AmigaOS like even a 600 MHz CPU can be overkill (just spoke with Rajnai Almos today concerning Petunia speeds under 604/180 OS4 today, and know beta1 users with MOS/JIT experience) - and believe me, on a G3/G4 even a static 68K emu with nativ PPC kernel will be blazingly fast, not to mention the MOS/OS4 JIT speeds and native applications.
Something important to remember: it's NOT windows.