What is preventing IM from oversupply like EM?

Lots of panic in the EM space right now given their governing bodies concern that by 2030, there will be a 9K physician surplus. My question is simply why is the IM-Hospitalist route not encountering similar struggles. Both fields are hospital based, have "HCA" residencies opening up every year, and are susceptible to midlevel encroachment.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Internal Medicine and IM Subspecialties Source Type: forums