I think that you are going to be surprised in the near future.
Just my opinion, but I think that we would see hundreds of different niches filled by different coins.
That's also my opinion of the "good" outcome of crypto, where you buy a crypto because you want to use it, and then forget about it. The thing that is needed for that are fluid decentralized exchanges (not big things, and not with all coins, but just linking a certain number of coins together, where essentially both parties put up some collateral (in one of the coins) to do the exchange, and then agree upon exchanging two other coins at agreed-upon exchange rate.
I see the future as coin to coin directly, without BTC being as an intermediary.
So you could have your own likable coin, and it could be traded on the spot for the one that the merchant accepts with a minimal fee.
P.S. but he would probably accept many