The issue with blockchain tps limit is NOW, and unless you have a system ready built to solve, all the arguments from you are pure fantasy.
Are you living in a world of talk and fantasy? Search the hardware sub forum, there are already people using ASIC miners to heat their house, and they are running them even it does not dig out any meaningful coins because they need heat anyway, and most likely they will upgrade to the new miner when they see a more attractive model
On the other hand, unless the big mining farms cooperate with distributed heating companies (which is extremely difficult due to their location), they will face huge loss when bitcoin difficulty is driven up by home miners by another fold
It has been proved that large mining operations are much more risky than distributed home miners, they either make big money or big loss, but their tolerance for a sustained loss is extremely low, many of them went down during the past year. Home miners and garage miners are not profit oriented, they could support the network regardless of bitcoin's price
At the end of 2011, when price had reached a level that mining is no longer profitable even for the most efficient GPU miners, many home miners and garage miners were still carrying on, because what they are interested is bitcoin, cost is irrelevant. But now, if the mining is no longer profitable even for the most efficient miners, I'm afraid that mining farms will shut down at large scale. A bitcoin network supported by speculative mining operations are extremely unstable, when there is no fiat money to make, those speculators will quit