Future of language in Russia

I am was watching a particular video on YouTube in Russian about future demographic condition (only at Russia), and some thoughts had visited my mind. Now Russia is one-language country, where it's normal know only one language, if an example you're clearly Russian nationality. But after 75 years (to 2100 year) population is very will declined, and there will be no chance to use only native ability to communicate, cases will had forced people to learn international languages.

Even now post-USSR countries are more and more rejecting from "Moscow language", and before 2050 they can almost fully removed that. Meanwhile Russian population will be decreasing by just dying, also from wars (no one knew about modern events, and no one'll can't know what happen else, we have 75 years yet), epidemics, etc. So, I think population of country will be more least than now consider. Understandably that, nation around 70 millions persons impossible be similar at modern Russia, that's still have USSR memory about monstrous empire, and folk over borders also still remember, and remember language from the soviet capital.

It will be fine know English or/and Chinese. And it's worrying me (I can't imagine that, Siberia will be have remainders of Russians, and even them will be different than now). I'll have see that future by my own eyes, I am too young (for joy or for sadly)…