by now I do have to wonder if it's even worthwhile anymore.
That's an appropriate comment if a notably superior successor is getting close enough to buy instead of the much delayed thingamy.
What else is coming that is 64bit, has Altivec, that many slots, etc? Sam460 is a good board, but it's a different performance/feature class item. And for those that want as high-end as possible, nothing else is known to be coming that would stomp all over the X1000, or even just somewhat surpass it.
The only thing I can imagine at this point, considering the PowerPC restirction forced upon us, would be something based on a many-core QorIQ, the 64bit version, with Altivec put back in. It's rumored that Altivec will return and be in some QorIQ chips, but not announced or known for sure, not by we the Amiga public anyway, and certainly not any details about what else would be in "The Return of Altivec" chips.
So, considering what we know about successors to the high-end X1000, waiting is annoying. Yes. But no longer worthwhile, from me the customer's point of view? There's nothing else to eclipse that board, so yea, we'll just go on waiting and waiting.