Generally if you have a lot of legacy selenium scripts it's probably not worth it to switch everything over, but if you're creating a new UI automation framework I've just never seen selenium as a first choice for that.
Don't get me wrong it's still solid technology though.
legacy selenium suites are a strong contender for vibium adoption. i think hugs has been surveying a ton of folks, he may have a better bird's eye view of the potential user base.
as for academic use of selenium, we have boni garcia - maker/popularizer or selenium webdriver manager teaching at a uni in spain. (maybe an isolated example, but he's rather known in the community)
vibium will also be a big tent project and support ts/js, python, java, and as many other languages we can support, too. but i started with ts/js because that's what's extremely popular right now. (and i like js!)
(side-note: i f'ing love nim, we will be supporting nim, too. getting nim on the tiobe top 20 is on my bucket list.)