There were A5000s planned by several differnt companies along those lines. Sadly the custom chips are not available anymore and so a new "old style" amiga just isn't feasable.
There was a time where amiga clones could have boosted the market, unfortunately that time has well and truely past. IIRC Commodore UK were thinking of openely licencing the custom chips so that could have been a possibilty. Gateway could of made some money out of Amiga this way too (there are loads of ways Gateway could of made cash out of Amiga, but that's another story)
