With regard to difficulty, it will eventually drop
It's already started - Bitcoin hashrate/difficulty has dropped about 20% in the last 5 weeks.
Part of that is probably Jihan Wu / Bitmain shifting their farm hashrate around for his "War on BCH-SV" - but it's been pretty steady since about the first of November and is STILL happening.
At this point, I refuse to even CONSIDER buying anything from Bitmain again - Wu's actions have been the primary cause of the current market collapse and have hurt ALL MINERS out of self-centered ego and greed, and I refuse to support someone like that in ANY way shape or form in the future.
Let Jihan Wu and Bitmain ROT - they seem to be having some major cash flow issues of late and they DESERVE to go bankrupt - and seem to be heading that way already at least in part DUE to their own actions that have killed profitability.
I won't say fuck bitmain they suck, but WTF are they doing?
Maybe they're even part of this action:
https://www.newsbtc.com/2018/12/07/report-the-biggest-crypto-bears-are-selfish-chinese-miners/
Only we smalll miners, whom control their input costs, will survive this. The folks playing this game will destroy themselves and many other large players (and mining difficulty) along the way. Hold what coins and gear you have. Be ready for the bounce back.
Here's a second artilce stating what I've been trying to say:
https://www.newsbtc.com/2018/12/07/bitcoin-cant-fall-to-0-nor-enter-a-death-spiral-mining-rules-deem-it-so/
TLDR: Hang in there. There's is still hope.
"...maintaining that BTC can’t just fall to nil. Antonopoulos elaborated:
“If [miners] wait until the difficulty retargets and the difficulty becomes less, then each miner who waits makes more profit because in the new scheme they have a greater percentage of the mining power than they did before. Let’s say if the mining power drops by 50%, the miners who stick around and wait for the difficulty to retarget are now twice as profitable after the retargeting.”