Then I think that more people would go over to just investing and bitcoin might even lose a couple of users. Many people were here just to mine some coins and now that it does not really work to mine coins now because of the halving coming many people are leaving.
Mining never ends for Bitcoin, after mining the last block of bitcoin, they are mining the TX FEE next. But as profitability is concern,it is too early to know if it is still worh mining during that time. Assuminig mining isn't that profitable, still there are enthusiast miners, that will never shutdown their machine since it gives them happiness. Like your feeling when you got your first BTC. I agree at those time more people will be into investing or more probably shifting to BTC as their cash ( hey it's 1 century after this year).