EM has lots of hope, despite all our B and Ming here. If EM tanks, it's likely that the rest of medicine has tanked already or is concurrently tanking. If you check out the other speciality forums on here they all have the same or similar concerns about their respective fields.
The better question is, do you really want to embark on this road (medicine)? It's a pretty good job. Frustrating a lot, but still good. Are you prepared to sacrifice a lot over the next 7 plus years (med school and residency)? Are you prepared for the reality of paying back 200k of debt (I'm assuming you are taking out loans). Are you ready to work wonky hours and miss family and friend stuff?
I'm a young attending and have paid back my loans while living pretty damn comfortably. I deal with a fair amount of BS but I also feel like I make a difference here and there.