Ok - the original comment was referring to the implied connection between electricity prices and mining feasibility. This is too simplistic. This assumes that there are no infrastructural barriers between the construction site and deployment site for bitcoin hardware.
OK
However, I postulate that new hardware "migrates" from easily accessible deployment sites to energy efficient ones. As such, hardware lives along a gradient with a drift towards sites with cheap electricity, where the forces pushing are bitcoin price developments and advances in bitcoin mining IT, to name two. (Thus the analogy to steady state systems). While bitcoin price is a somewhat reversible process, bitcoin mining IT is not.
As usual, it "depends". If it were an efficient system where only the high cost electricity zones would deploy the new hardware generations, you could probably maintain a decent amount of asic generations operating between the high and low cost electricity zones (a new generation could push the current one to a lower cost zone). But this would assume no new generation is deployed directly in the low cost zones.
I would think everyone investing significant amounts will tend to operate in the lower/lowest costs zones, so it would skew the system dramatically (and the "steady state" could only work with few generations of asics).
But is a "semi steady state" really a "steady state"?
What this likely means for mining equipment providers is that in the intermediate term the ability to migrate and maintain beats efficiency. That's why developments by Allied Control are so interesting which focus on ease of deployment.
Here you're opening a whole new can of worms. I think that would depends on your OPEX. CAPEX is high with the tanks but if maintenance (OPEX) is low enough, it would be a decent target for countries where labor and space are expensive (but what of electricity costs, what of heat dissipation power usage?). If OTOH you have cheap labor and space, the tanks aren't looking that good anymore.
Also, unless there is a way to stack them, they won't really help you improve the density of your deployment (they have other issues with connectors, plumbing, etc) vs a regular datacenter (more on that after the end of June, I guess). I'm not really sold on the tanks, I think the idea is neat, but the numbers don't convince me so far (probably need more data).