I'm still predicting Russia will break up further.
I think future historians will see the Arc of Russian history as about a century and a half of Russia trying different forms of imperialism in pursuit of Eurasian hegemony (an Empire, Communism, the Russian Federation), only for all of them to fail because a superstate with artificial borders that stretches from the Baltic Sea to the Berring Straight should not exist. It's too big, with too few people, bordering too many countries. It's intrinsically unstable.
I think the Russian Federation will be viewed as a pause in "the Russian Empire's" continued decline. The breakup of the Soviet Union and it's relationships was the latest phase of disintegration. The break up the Russian Federation will be the next one. But it'll be part of the same historic event, separated by decades. The disintegration /transformation of the Roman Empire, which was similarly vast, had similarly artificial borders and bordered a huge number of "countries" with too few people to populate its vastness, all so proceeded in stages rather than all at once.
This is by the way, fantastic for the world. Nuclear weapons are expensive to own and expensive to make. Russia with it's population of 140 million (only a fraction of which are taxpayers) can barely afford what it has, even with it's (declining) oil wealth. You want to disarm Russia? Shrink its tax revenues.