In short: if we increase the number of transactions per second then big miners could (and would) naturally mine smaller blocks (for a short time) till the transaction waiting line appears again so that fees increase.
That's monopoly, and that's what scares me, you and everyone over the Bitcoin network because they know that they are the life-line of the whole network.
They have interest in maintaining a constant waiting line.
I agree with you here because they want bigger values in fee but they should understand that this will only drag users far from the concept of Bitcoins which was meant to serve everyone to make it possible for everyone to transact at lowest fees. The value in fee/transaction is probably still lower, but I believe if this monopoly will continue, we are not too far to see even $100 asked as a fee.
Maybe they already do that now.
The real problem is in the concept of the fees itself: paying fees don't make transactions go faster, it just makes individual transactions pass infront of others. Nothing absolutely wrong here. But it gives incentive to miners to keep the waiting line and this is wrong. Also it is only a short term profitable strategy as higher fees and higher profits will bring more miners and so then less profit. So it starts a vicious circle that worsen the problem we wanted to solve at first.
This is not the real picture actually, just think that if governments kick in and take the advantage of this by taking over the whole mining concept, it may go centralized and everyone will suffer which is a real threat to the whole community.