@Gargron
I'm against it. But if you do it please consider these controls:

1) users must be able to disallow quoting on all their posts or on a per-post basis.

2) If someone quote-toots you, you must get a notification of it, and

3) If it's abusive or you don't like what they did with your post, you can opt to "block" the quote, meaning: the quote no longer appears in their post, and their post is no longer linked to you or your post; your post can no longer be reached from there.