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When oligarchs realise they can no longer go to Nice or Monaco or Amalfi coast or whatever, they'll deal with Putin themselves.
It is an inconvenience but they will just go to Macau, Dubai and anywhere else East. Russia isn't like North Korea, it has a huge amount of natural resources and has a natural resource hungry neighbour, he has made the calculation he can pivot East to survive. Which kind of flies in the face of his rhetoric that losing Ukraine is what made Russia lose it's place in Europe and why he wants it back.
An example being he has probably lost Nordstream 2 but will offset some of that loss with the proposed Power of Siberia 2 pipeline. That pipeline would allow them to redirect their western oil fields that feed Europe to China.
Russia must be fully cut off from the west and join North Korea club. Full on embargo. No visas, no commercial flights, no connections to any finances in the civilised world. When oligarchs realise they can no longer go to Nice or Monaco or Amalfi coast or whatever, they'll deal with Putin themselves.
All these talks from the west reminds me of a school teacher who's just "concerned" about the bully, and the bully smiles at you because you're the next in line to get your ass kicked.