If there is still something to mine, then it could collapse. But if BTC is established widely enough, then mining may not matter(in such an odd and improbable scenario). Something would have to trigger the demise of mining, and that would be the root cause, not the end of mining itself as the root cause.
This is not how bitcoin works. The process of creating blocks must continue for transaction confirmation to occur.
Agreed... Nobody mines.. nothing is accomplished.