The people who still live there are much better off than their former CCCP brothers in Belarus and Russia
If the only way to improve quality of life in Russia, is to divide national income by a population only half the current size, then... I don't think I want to live in a Russia like that. To me - depopulation is the biggest tragedy and the greatest possible humiliation. You may not believe that there's place for such thinking in an orc brain, but I do think that our best asset is our people.
Regarding the ethnic structure of the overall demographic picture - yes, Russians are still declining as a share of the population. The highest natural growth rates are in the republics of the Caucasus, and among the Northern peoples like the Chukchi (our eskimos). My non-scientific take on this is that these two peoples had enormous drops in population earlier, and this is Mother Nature somehow playing catch up. As far as what Russian-majority regions are still growing organically, it's: Moscow, Crimea (Sevastopol), Krasnodar (Krasnodar; Sochi). However, the drop in the population of Russians cannot be compensated by growth among Chechens, Ingush, and Chukchis. The lion's share of growth comes from immigration.
Before the war, the UN listed Russia as the number 2 emigration destination in the world after the United States. Throughout the 90s and early 2000s this flow was represented by millions of ethnic Russians and Ukrainians fleeing the other post-Soviet states back to Russia to escape ethnic discrimination. Then they were followed by millions upon millions of migrant laborers. Largest among these are Uzbeks, Azeris, Armenians, Tajiks, Kyrgyz, and Georgians. Kazakhs never came in any meaningful numbers because the economic situation there is arguably better than in Russia.
When the stream of former Soviet peoples inevitably dries up, Russia will have to look farther afield for people and this is always fraught with instability. However, Putin says that Russia needs a population of at least 400 million to be able to shape events in the world, and there's no way we get there without letting in some large numbers of Chinese, Vietnamese, Indians, etc.