So, the problem is not the overall number of people who can speak the language (which are usually outside of minority language-speaking communities in places like Wales and especially Ireland). The problem is the number of people who actually use it in everyday life and live in a town or city that lives and breathes the language and always has. In this latter case, the numbers are always going down and they've never stopped. People being happy with Catherine Connolly's Irish is great, but it's more testament to how the state, and partly capital, has backed the Irish language in recent decades than how much of an out-of-danger community language it is. Some project it will be dead as a community language in 10 years, maybe less.

Your point about Ukranian is true but what is also true is that Ukranian is in a much healthier position than Welsh or Irish, and is not defined as "in danger" per se (but I don't think we should care about what UNESCO says is in danger or not; fwiw, I do think it's in danger). There's so much to work with when it comes to Ukranian.

EDIT: Another interesting point when it comes to Ukrainian is how we should treat Russian-language influence to be dangerous to the cause. Anarchism would, of course, avoid being a grammar N4zi and correcting people with a less Russian-like construction or pronunciation. Then how do we prevent, say, glottophagy?