You will have to forgive me but Bitcoin is no longer an experiment. There are probably little old ladies in China who have put their life savings in Bitcoins. If everybody thought Bitcoin is just an experiment the price would probably be back to $12 or under in a heartbeat. If it's just an experiment, this needs to be better advertised.

One theory of transaction cost:

A days transactions must pay for a day's network cost. Of course, after the last bitcoin is mined the network will be monsterously huge as everyone tried to get that last incredibly valuable Bitcoin. No one will be able to afford that fee. A fee advertisement mechanism will have to be used to reduce network size. Then we are back to my original problem of monopolization.