Far, far less likely. Svelte has undergone some changes, and will continue to do so, but the latest round of change swung heavily in favor of USING THE LANGUAGE. Most of what you write in Svelte, with some notable exceptions, is vanilla JavaScript.

We in the Svelte world love it so much, it seems highly unlikely there will be any drastic switch from what we've all grown to love. (It's truly fantastic, give it a whirl: https://svelte.dev/repl/hello-world?version=3.5.3)

(Side note: I actually clicked on this link hoping Vue was learning a similar lesson, only to be disappointed.)