How about not buying pci 5.0 drives and just sticking to passively cooled 4.0? There is almost no difference in random read and writes, sequential reads and writes on 4.0 are already beyond what most of us consumers care about anyway.These desperately need a more proper cooler and heatsink solution.Two to four of these in a PCIE 2-slot vertical mount enclosure with blower fan on the end to exhaust the heat would be nice. Something akin to mounting a GTX980 cooler on a x2-4 PCIE 5.0 M.2's with a riser cable would be pretty great. I think a more sizable cooler and fan combination would even be a little overkill for that scenario perhaps, but that's fine because at least it could run at a lower fan curve and/or passively at times.
I for one refuse active cooling on motherboards and ssds, just not having it.