Cryptocurrency is not physical and I dont think people are ready to adopt it the way it is. Majority of the people are not ready to be using devices anytime they want to make payments in a store , they prefer to pay with cash. And there are lots of business that prefers the current system cause it works best than making use of crypto. Trying to explain this will be a very long story and Im not going to do that right now.
I dont think adoption is really a problem to the crypto market and I also dont think it was meant to be a currency like some people claim. All these people saying all that are just some cryptocurrency fans that never get their facts right before spitting it out lol.
The only thing might be a problem is the volatile nature of cryptocurrencies, but to me thats not really problem as long as Im investing in the best coins, especially the top coins like Bitcoin and ETH. Volatile nature will remain intact for near future too as this is how basic concepts of cryptocurrencies was designed. We need to accept and bear it if we decide to adopt cryptos.