Part of what makes smart people valuable is that they can learn new stuff. The specialized part of an undergrad education can be done in under 2 years, 4 hours a day (even assuming no shortcuts or speedups), which is not that much time if you're making plans for over 5 years out. So although it certainly seems like you have some strong comparative advantage in one field, you can still change tracks pretty easily.

Quantum computing startups are a bit tricky, because of the huge seed investment for low temperature and nanofabrication equipment. Maybe if people get spin qubits in diamond working at liquid nitrogen temperatures it will be cheap enough.

But, hey, if it floats your boat, go for it.

P.S. your link should go here: https://www.youtube.com/watch?v=igPXzKjqrNg