I'm afraid some big company or group of companies will make their own crypto, like Facebook Libra, and also make possible all smart contracts and other benefits of the best cryptos. They have so many funds and developers and power to do this. And most people don't really care if something is centralized or decentralized. We all are walking on Earth with centralized money in our pockets.
Or, somebody invents a totally new crypto system and all others will be worthless. :)