Honestly i think mining will continue. Lot's of big farmers are already in total profit, and lots of them without any or almost with any electricity costs. It would be needed BTC to make a huge drop, probably to bellow 100 bucks or something, and even that...
Now there are several possibilities, since btc still is the strongest coin and leads the fluctuations of other coins, if all the other coins drops 2 and any of them takes the lead to become the primary trading pair, ppl would still continue to mine btc. If any other takes the lead, even there ppl wold continue mining as it will take a long path for btc to stop being one of the strongest coins.