1 - will mining will ever stop Huh?
For each cryptocurrency concretely - yes, because each cryptocurrency or almost each has the limit. In common as the field of activity - no, because miners process transactions and makes cryptocurrency decentralized.
2 - what will happens when the cryptocurrency reaches it limits ( example : bitcoin 21M , ETH .... , and other curriencies ) ? will they win money after the currencies reaches its limits ?
I think the price on these cryptocurrencies will soar to space.