Which means you wouldn't bother trying to mine a block. Seeing that no one is bothering to try to mine a block--and so their transactions are taking forever to

Which means you wouldn't bother trying to mine a block. Seeing that no one is bothering to try to mine a block--and so their transactions are taking forever to complete--people would increase the fees they are putting on their transactions (which doesn't even require them to know what is going on, as that's what they would presumably try to do anyway) and eventually enough high-value transactions would exist to make it worth trying to mine a block with them included.