The thing is, most people already have powerful x86 boxes (more powerful than the X5000 in fact) for demanding tasks such as gaming, rendering, scientific calculations or whatever, and only want an AmigaOS system as a secondary box. The small size and equally tiny power consumption are actually advantages then, and performance isn't crucial as long as it runs AmigaOS apps at decent speed and can display most standard websites.
Indeed, until AmigaOS gains 64-bit and multi core support, the additional power is mostly wasted (you can run Linux, but then again, you can run Linux on your cheap 5 GHz overclocked quad-core x86 CPU with that GTX 1080 and 32 GB of RAM, too).
I don't see that as a legitimate excuse to buy something with that weak a cpu.
And the fact that it won't be able to upgrade to a 64bit OS (should we ever see that) is hardly a selling point.
Also, if the 31 bit memory limitation is lifted, then you've only got 4GB of address space (leaving abou 3.5 GB after I/O is considered)..
Further, I have X64 hardware, but still use alternative hardware.
I just don't think its such a hot idea to buy something with less performance than an over 15 year old G4 PowerMac.
Its got a PCIe slot? Will that matter when even a moderately powerful video card will be bottlenecked by the cpu?