My biggest fear with TS is people forgeting why TS exist in the first place and stop trying to solve the problem TS solves because it's already solved. It's not solved, TS is by far the best option, but its far from being ideal. Deno coming out of the box with TypeScript support and the JavaScript Type Annotations Proposal [1] gives me faith that we will grow past TS.
[1] https://github.com/tc39/proposal-type-annotations