I say no, and I also say that I certainly hope that it doesn't happen (at least not at the expense of the stand-alone app).

By the way, linking bbPress and WordPress is dead easy. It is as simple as adding a few lines to bb-config.php. That will link user management for bbPress and WordPress, which should suffice for most integration needs.

I've not tried so-called deep-linking (which would load WP along with bbPress), but it seems like it wouldn't be that complicated, either. It is possible to do so even now, which would allow for, say, integration of comment threads and forum threads.

But, even with all that integration, I don't want to clutter up my WP admin back-end with bbPress forums/threads/posts/etc. admin - and vice versa.

I see no harm in keeping them separate, and no real advantage in combining them by evolving bbPress into a WP plugin.