Stop worrying... This "ban" has nothing to do with what Apple will decide to do.
Yes, I realise this... But it feels a bit ominous to me. It's coming to something when Apple are so slow to release updated hardware that the current hardware has to be removed from sale due to breaching safety regulations. That can't be good. I mean, how difficult is it to redesign a tower computer? Apple business is designing and manufacturing computer hardware after all. It's almost as if they can't really be bothered. That's my worry.
Based on your "I need..." list, I think you should just buy one of the Mac Pros that are currently for sale. This will take you several more years into the future, and then you will have time to see what Apple does regarding the Mac Pro.
It's definitely an option. But I'd prefer newer processors if I'm plonking down a lot of cash on a new machine. And I know I'll find Thunderbolt very useful moving forward. There would be no way to add Thunderbolt to the existing M.P. even if you did have a spare PCIe slot.
By far the best scenario for most pros would be that Apple develop a new Mac Pro without f*&king it up by taking half the pro features off it. It's surely better to include expansion options and find some users don't need them than try to second guess what pro users don't need and lose sales as a result. The Mac Pro is Apple's super-powered swiss army knife for professional users - it doesn't warrant the same stripped-down design and price point as their other Macs.
Hey... d'ya think this will force Apple to announce the "new Mac Pro" (if there is one) by the end of February?... So, if they're going to dramatically change the features, people like me can still get the old one before they disappear from sale?