Also, what happens when miners' reward gets to 0 and they'll be just given comissions?
when the rewards go down the commission will go up. All is well.
Who will use Bitcoin with an average comission of $100? That would kill the whole system.
There are two paths you can go by, but in the long run, there is still time to change the road you are on:
1) Small number of transactions, high fees
2) Larger number of transactions (will require a change to the system), smaller fees
This is the choice we are faced with.
Right now it is looking like: small number of transactions (3 transactions per second) and very larger fees, as you point out.