[p1esk]

There are many reasons why this hasn’t happened, but I think you pointed out the main one: English is the language with the largest existing community, so I think most Slavs would rather learn it as the second language, unless there’s a good reason to choose a different one due to some circumstances (eg proximity to a border, widespread business with a certain country, etc).

[eequah9L]

In Czechia, English is definitely the most reasonable L2 to learn, by far. Even for L3 I wouldn't be sure Russian is a better choice than German, which is just super useful around here.

I learned Russian basically for irrational reasons. I'm glad I did, but I can't say it is very useful.