Not knowing the technical, or legal arrangements of SWIFT doesn't prevent one from making a traditional international wire-transfer.

My 70 year old dad can use bitcoin. I'm sure your friends can learn.

Your 70 year old dad is an exception in a sea of people that don't want to learn.

One comedian put it this way: You can't fix stupid.

Point being: Learning is a lifelong pursuit, and if you don't want to learn then you will be left behind using Facebook Messenger to send money. Kidding, but you hopefully get the gist.

But at what expense? The existing system is not that broken for majority of the world so why should they care about learning this?

That will change. Cryptocurrencies are here to stay. There is no undoing decentralized commerce. It will change the world in ways we can hardly fathom.