The OP is likely trying to deliver something like Superhuman ($30/month) - speed and keyboard focused-email - but for todos. I would imagine there is very little overlap between that market and people who use vim or emacs + plugins.

Fair, though I do think there's value you might be discounting here that ISN'T keyboard shortcuts. The market isn't all vim/emacs users, it's complex Omnifocus-style todo app users, who are frustrated with the lack of keyboard support in those apps. These users are more comfortable with this price point than you may expect (IMO) but will need feature parity for things like OmniFocus perspectives/floating timezones/easy outlining.

A CLI app is not something I would want to use for something I touch every 30minutes, every day, from many devices. But I do use vim for text editing.