So, after the production of BTC will reach its full extent of 21 million BTC, will the bubble burst? And bitcoin will come to an end? And other cryptocurrency will take its place??
There is no bubble man. There was bubbles, but now its normal price, normal market movements.
After all will be mined, transaction fees will suffice for paying for mining gear, because there will be so much transaction (there is already).
So worry not, bitcoin is strong, designed amazingly.