Seems reasonable and useful.

Would require the ... operator support, which will get difficult. As then it would be reasonable to support syntax like

const { x, y } = vector;
// and
const [x, y] = vector;

as well as some other ES6 goodies, like destructuring function parameters. This is by no means an easy thing to get right, but super useful to have.

A change like this will require a ton of testing.

I think it's more important to support { ...x } support before destructing assignment