They confirmed earlier this year their intent to reboot (pun not intended) the Mac Pro line by releasing a new design for the Mac Pro in 2018 that focuses on modularity.
Yes, we will see what that actually means. Technically speaking, the trashcan is "modular", inasmuch as you can connect modules to it (all over your desk.) That was a terrible idea. It remains to be determined if they're willing to admit that and fix it, or if they're going to keep doing "courageous" things to their users without lube. Recent idiocy like removing the 3.5mm audio jack does not bode well for future design decisions.
In their discussion, they were mostly talking about how the design was thermally limited and that bit them in the GPU / CPU upgrade path. Of course, that was stupid too, but if that's the only focus, and they still think cables everywhere is a "good" idea, then we're back to square one: the only good Mac Pro is a pre-trashcan mac pro.
Drives, memory, graphics and other cards - all of these need to be secure inside a sturdy, upgradable and serviceable chassis. Short of that, the pooch has been well and truly screwed, and the PC makers will eat the market.