Studying a thrilling profession vs studying an applicable profession ?

I'd really like to study genetic engineering because I find it a cool skill. But at the same time, job positions for genetic engineers are few and far inbetween. So while I'd potentially be good at something few people can do (=high paying). If I studied something like law, I'd be much more flexible geographiclally in terms of finding employment. So I'm wondering whether to aspire to a more common career and take GE as a hobby that I'm studying, or if I should double down on GE and work in a café until I find a job in that. (I might decide I want to pivot away from GE once I learn it anyway.) What do you recomend?