Abramovich bought a club for £140m, invested around £1.5 billion in it, and now it’s worth twice that. It’s worth is based on what a prospective buyer will pay, not a multiple of earnings.
The argument you are making is equivalent to 'now that he won't pay for the gas, who will buy the Lambo?'
Owning one of the greatest teams in the world in the most fashionable part of one of the world's major city is basically just worth it as a vanity asset to a certain kind of billionaire.
Is FC going to double next year? And the year after?
The interesting part in this is not that will sell a club, is that will announced that will sell all his properties in UK, in a context of big economic sanctions.
You didn't list the most popular reason: Money laundering.