Having been in the field of emergency medicine since I started my residency in 1996, I can tell you that the discipline has had its ups and downs. Currently, the specialty is facing a lot of challenges: COVID has driven some physicians out (to utilization review, administration, research) and has adversely affected others emotionally. Additionally, there's a tremendous dearth of positions currently for emergency physicians. I've had friends and colleagues lose promised hours or their jobs entirely in the last 18 months.
Here's a short piece on the job scarcity issue. Those choosing a specialty must consider the atmosphere of the job market (while recognizing it might improve in a few years).