I forced myself to learn Vim for the same reason. I could rely on Vi being available on any system I logged into, which was quite a diverse set at the time with installations going back many years.

I've thought that I should learn Emacs just to see what the fuss is about and so I can make an informed decision about the differences, but the fact is that I no longer have the pressure to put in all that time. Vim works for me, and I there is no compelling reason to invest all that time learning another editor as an experiment at this time.