For sure! But considering Mastodon has most of the content that would be quote posted this way and most of the users who would be subject to it, and they are working on it (at their own pace), I think it would be tactile to see how it is implemented in Mastodon first and then proceed from that.
It could for example be that Mastodon users will be able to opt out of quote posts in general or in specific posts. If so, this should be respected in other implementations as well. And in general, it’s just nice to have things consistent, and when it’s taking the Mastodon team so long to implement I suspect it’s because they’re devoted to making sure they do it right. :)
Mastodon users can post to the Threadiverse by tagging a community, but since we don’t have “quoted boosts”/quote posts, there’s no way of including an existing thread or post when doing so.