i don't know why people are worried about diff increase all the time, the ratio between the profit and the diff will always be the same, so if many will join and it will be not-profitable, other will simply leave
it's not like everyone out there has free electricity, that would be scary, because they will dump until btc is zero in value, but even then there is the halving...
are you implying that difficulty and price have forever been synchronized even if not in immediate fashion, ergo increasing difficulty will yield increasing price?
secondly, and possibly a crude iteration of what you said, I think that mining will essentially cease at the halving because only those with 16 or whatever nm architecture will even attempt to survive and technology won't meet demand for 4 or 8nm...at least nowhere near the halving time.
As it largely now is, two or three companies will control everything after the halving and even they will be forced to 'pan' for their pay. If correct, will the diff after halving maintain the synchronization with price that I interpret you've suggested?