The weakest point of btc which is causing hindrance in its growth is the scalability issue. For btc to become a currency of the world, scalability needs to tackeled. The other point is that it is hard to understand. You cant bring everyone to the the cryptos because of that. This limit its use. Also, it isn't really convenient for everyday retail transactions. It is slow and cumbersome in such cases.
For the scalability and the speed of transactions problem we have the lightning network. Businesses just need to run a LN or use someone else's and they're good to go. Transactions are instant as far as I know using LN. I agree with you that blockchain technology is hard to understand for the average joe and most of them don't want to put the effort to do it, so I think the solution would be to create user friendly interfaces and ecosystems where the user can use BTC and other cryptocurrencies just like he would be using money - eg. select a name, enter the amount to send and tap on "send" button & vice-versa. QR codes would be useful as well. As a matter of fact I've just given myself an idea. lol
