People already got rich with bitcoin. I think people still get rich with bitcoin, but don't ignore other rising coins. Altcoins are real and altcoins will rise significantly. There will be one or two huge players, which will literally lead to mass adoption. Would love to know, which coin(s) that will be.
Just keep in mind: Cryptokittens brought blockchain to masses attention. They don't know what Ethereum is but now they know cryptokittens. It could be anything that brings blockchain & co to mass adoption.
Maybe a payment service, maybe a game, maybe retail market. I don't know, but I don't think Bitcoin will lead to mass adoption. It just creates the image of cryptocurrencies, but now someone will step forward and bring cryptos/digital assets/blockchain to the masses.