What happens after mining eth ends?

Once Ethereum mining is over the miners have 2 choices. Liquidate their GPU rigs or go to other coins. Assuming 50% keep mining and 20% switch to RVN that means 10% of current eth miners will start mining RVN shortly. (If not more) My question is: What will happen to both the ravencoin network difficulty and the RVN token price once that happens? Is there any way to forecast this? Thanks 🙏