Yes, I agree that there will be pressure on managers from investors, and they will try to recover their margins in several ways, but if they try to recover it f

Yes, I agree that there will be pressure on managers from investors, and they will try to recover their margins in several ways, but if they try to recover it from price increases beyond what the tax incidence suggests, their margins should be lower - and not higher, so they are unlikely to do that. Now, the other effect you suggested is interesting, there are firms that exit the market because the margins are unable to give the returns that investors expect. However, this is factored in the supply curve, particularly in the long-run supply curve, so the microeconomic model still stands.