These larger and more efficient operations will be motivated by profits, but will likely be more interested in maintaining the network security to ensure bitcoin profits in other endeavors rather than directly from mining itself. I would not be surprised at all if the BitCoin world of 2030 is almost 100% institutional (finanacial houses/banks) mining, with partnering agreements on planned hash levels to help reduce costs, and a big warehouse full of standby gear that can be powered on if a rouge does appear on the network.
You had me up till the concept of miners hevily invested in hardware continuing to mine so that bitcoin continues.... I don't see that happening at all. Just like poeple will sell their GPUs when it's not profitable to mine, those who bought into ASIC expecting profits will shut down when there are none also.
I'm shutting down and selling my GPUs tuesday, maybe wednesday.