Unless there’s a major change in the wireless technology, such as a hideously expensive digital hybrid multi-plexed single transmission carrying 2 RF signals going in opposite directions, I don’t see that happening. Not to mention there would probably all sorts of latency issues to work out, bandwidth, distance, antenna design, etc. I’m strictly guessing at this from my meager experience as an RF tech on live production shows.
I regularly use a wireless instrument pack and an IEM receiver pack simultaneously. An IEM pack on my left side, my bass wireless pack on my right. Both packs on my belt (so I can use the bass pack with more than one bass). This is no problem for me at all