Mining when blocks are depleted

[ridertiger]

Now there are many miners with huge hash powers because they are being rewarded with bitcoin when they confirm transactions and such.
What incentive will they have when all BTC is mined in, I think 2049?
Do you suppose the transaction fees will increase, making it like the dreaded SWIFT?
Maybe the computers will improve way faster than the difficulty increase. In any case, somebody argued that btc would be useless and the price would drop. Any ideas on that?