I think it is worth it to try this but it will likely go the way of Esperanto. English really is NOT especially challenging compared to other languages. And as anyone who travels in Europe will realize, there seems to be little problem with people learning it as a second language.
I'd say that's not so much because of whether it's easy or hard to learn or not, but because the vast majority of media (mostly movies and TV, but nowadays also the internet) is in English, often subtitled. Some countries dub it (like Germany), so the level of English there is often lower.
It's amount of exposure, clear and simple. Replace English TV with Spanish or Finnish or maybe Korean and you'd probably have the same effect. That said though, English is relatively close to western-European languages; similar origins and influences, so the barrier to learn English in addition to a western European language is lower than learning Russian or Korean and, arguably, Spanish or Italian.
