Let's say that the difficulty adjustment (that I forgot to mention about TBH) takes place right after the hashrate has dropped significantly, won't the small miners still stand a chance at trying their hands on getting a block or more?
I'm not saying that they go for solo mining, my main purpose is to know that if a big herd of small miners (more than 100k or maybe more) go ahead and try their best to earn something out of this opportunity (only if difficulty adjusts down quickly), will there be a possibility they make some bucks against their mining activity?
The difficulty adjustment period is about 2 weeks. If the hashrate drops to half after one week, then there will still be 2 weeks until next adjustment.
Of course, it can happen very close to the adjustment block/moment, but the chances are small.
However, if the difficulty goes down
very much then yes, probably smaller miners will have a chance again. They may need pools be adapted for them though.
But I would not be hoping for such situations because then a business with a lot of dormant (less profitable) ASICs can fire them up and perform a 51% attack. Risky.