some elites maybe, but their kids will only be after a couple of generations. It's one thing if you yourself cannot spend time in London but if your kids and relatives also cannot leave and buy a new iphone suddenly you have people to answer to.
Those later generations are currently reaching prime age and they are leading comfortable shock-free life that just reinforces their understanding of how there can be no consequences for association with Putler.
It's clear that they are immune while if you are a regular person not associated with government and elites you are hurt by war and sanctions. So what do regular people do? Try to be associated with government and elites as best they can. How? By supporting whatever the government does.
I think you underestimate how simply a desire to have nice life and signal high status can change political outcomes
I don't think that can work. Russian elites absolutely value power over Western way of life. Sanctions are only needed to starve Russian economy to a point where it cannot finance war - and it has been a mixed success so far, but in principle can work.