Derech: I agree completely that we should try to get everyone to study Torah or study more Torah. At the same time, we should also try to make sure everyone works at least a little bit too. Chazal say very clearly in Avos 2:2 that Torah and work should be combined. Torah study must provide more protection when we’re doing it the way Chazal said it should be done.
Chazal might not have said one should become a doctor to save lives. But they did say to teach one’s son a trade, and to teach one’s son to swim (this also saves lives). Teaching one’s son a trade presumes that one knows a trade. And as you know, Rambam, Ramban, Ramchal and many other gedolim who devoted their lives to Torah study also found the time to become physicians and, presumably, to save lives with their medicine expertise. We can’t say that we know better than them now, and that their medical activities were in fact a waste of time and bitul Torah.