Lets see if I understand it correctly. I can wait until there are no more unmined btc. At that point the miner's only reason to continue mining is to get his fixed fee for verification. I can then spend a few thousand on mining rigs and provide the lowest fee (or for free) for verification, thus making it financially unfeasible for the existing miners to continue. In a few months of running at a loss I *should* be controlling more than 51% of the network because all the other miners have quit.
At that point the entire btc concept breaks down. I can seize coins (by never verifying them), transfer coins to myself, reverse verified transactions and possibly even "magically" create new bitcoins that I then proceed to verify.