Take Nano for example: sub-second, 0-fee transactions, of any amount, to any (unbanked) person in the world. Of course, there is no way that any other (fiat) system can achieve this (due to operation costs, regulation, etc)
But the response of skeptics will always be "but I have to convert my fiat money". And at that point, it's not free and instant anymore.
But just because the new system loses its benefits because of backwards compatibility with the old system, doesn't mean that it is inferior. Maybe for some things, you don't need to pass through the old system anymore. One example is mining pool payouts, which can do payments through Nano to get the 0 fee transactions. (see https://2miners.com/blog/how-to-get-payouts-for-ethereum-min...).
You can argue that this mining is all a scam etc, but in the end real value is transferred using the most optimal network. More optimal than any central system that you can think of (remember 0-fee, instant trancations).