I'm generally ok with the speed of payment. I truly take issue with some properties of the Fiat money, though. Especially with the fact that banks can lend it into existence out of thin air. I can see why someone from a bank would downplay the fact that I am probably not alone.
I don't think of it so much as that they can create it out of thin air. Rather, the deposits you hold at a bank are not real money, but a mix of loans, stock investments etc., with a small bit of cash reserves so they can pay out the few people who want some cash at any given time.
True. The smallest fraction of money is in the form of cash of course (the only form of legal tender in germany, for example). Banks are engaging in fractional reserve lending (no surprise). Point being: could they do it with bitcoin? Theoretically yes, if they can get everyone to deposit their bitcoins it could work just as well. Central bank would be replaced by bitcoin network. In practice it wouldn't work well at all though, because bitcoin is way easier (cheaper) to move / store / transact online than cash. It's digital cash.
Banks runs are just a mouse click away.
They can't let that happen so they'll divert the attention to "blockchain tech", do a little "embrace and extend" magic and hopefully be done with bitcoin.
I am reasonably sure that if bitcoin becomes widely used, fractional reserve banking would still be used quite a bit. I don't think fractional reserve banking is pure evil, but rather problematic is that people perceive it as equivalent to cash (more like a vault) instead of a somewhat risky investment. The fact that often governments insure these bank accounts (up to a certain sum) certainly helps this perception of it being 'risk-free' money. And when people start thinking stuff is risk-free when it is not, things can turn ugly.
In a bitcoin world, I do think there would be less fractional banking because it's easier to 'be your own bank(vault)', in a quite secure way. Adding to this, the average returns from investments (loans, stocks) might not be dramatically higher than bitcoin appreciation due to productivity gains and population growth, making non-bitcoin investment relatively less attractive (which would slow down economical growth somewhat, but also decrease malinvestment).
My 2 cents.