I'll admit my lack of knowledge, but as far as I understand KHL salaries still depend on a strong (sponsor) industry intertwined in world economy. If sponsors don't have the income, the worry about the value of Ruble is secondary, no? If the car/steel/chemical products manufacturing plant is suffering the 285k salaries are a thing of past. I'm sure there are couple of teams that will be able to ignore the sanctions and continue as nothing has changed, but will teams like Severstal or potential substitutes like Lada still have teams at all?
It's a bit of a different thing not directly related to the RUB fluctuations and I'd say it might be more important, but here we need to be looking at the team by team basis.
Obviously the rich teams will still be doing fine, also the ones owned by oligarchs like Severstal, on the other hand teams like Admiral (or Lada if they will join, which I kind of doubt) will be pretty bad financially in any circumstances, they're just cursed
. Looking at the team list I'd say Neftekhimik might be at risk, also the mostly region government financed ones: Traktor, Torpedo, Sibir. I'd put a question mark on Dynamo Moscow too due to the VTB bank being under sanctions, not to mention the strange things always ongoing in Dynamo's management, so you can never know. On the other hand, for obvious reasons a solid amount of money will be saved on foreigners, as not a lot of them will be signing.
All those things are hard to predict, but long story short: I'd expect an exodus of the majority of foreigners, but as for the local players I don't expect them to suffer much (if at all) in terms of salaries, so their exodus seems unlikely to me (not to mention that it will be harder to get work permits for them in a lot of countries).