For now, I believe most hospitalists groups have no midlevels. The few that use them have them as admitters or for pager cross cover. Certainly the situation is not as bad as CRNA encroachment.
Overall, in the broad scheme of things I don't see having midlevels very beneficial in hospital medicine. For eg, I get 220k to see a day time pt census of 12-14 with 1-2 admissions. During nights I cross cover, attend rapid response and codes and admit 5-6 pts plus supervise midlevels. Our midlevels during the day carry 4-6 pts and at nights admit 3-4 pts, sleep for 4 hours and cross cover for 3 hours.
They are useful if they do physician level work for half the pay but they work proportionately less (at least in my place).
I also assume the admins might try to squeeze salary from higher paying specialities like GI, cards, anesthesia by using more midlevels. I don't see the value of trying to save 50-80k in salary by having midlevels who cant see as many complicated patients as physicians.
Im sure if the midlevels are given my responsibility of busier census, rapids and codes plus the liability they will ask for our pay.
If the market gets saturated (which will probably happen) people won't be upset with a salary drop from 220k to 180k compared to let's say 350k to 250k. Heck, I always tell that our midlevels have a chill 8-4 job for half the year for seeing 5 pts and getting 80-100k. If I'm the admin I'll fire them and give their pay as a bonus to the other 4 physicians if they can split up the N census of 6 pts (our rounds will be 30 min longer). Sadly, this world famous academic place I work for is a midlevel factory who thinks midlevels with more than 5 year experience are as good as hospitalist (of course after free residency training under your license)
Admins are hiring midlevels partly to put us in place, to remind us that we all are replaceable. My worry is not job security but the same concerns every speciality has, being forced to work with these rogue midlevels who do **** under our liability and not really collaborate with us.