Few factors to consider here.
Firstly is you must take into account more or less everyone staking is well aware their funds are locked for 2+ years unable to withdraw validator. I do not think we should question those running validators' resolve towards the long-term commitment to Ethereum. If these people were willing to skip a bull run and stake, it's safe to assume they won't dump.
Secondly, there are nearly 120,000 validators equalling 3,822,507 ETH total staked. With a 32.78 ETH average balance currently. Let's assume they are going to be able to withdraw in 2022 with a profit of 5 ETH assuming 8% APY stays steady which it wont because more validators will continue to join the network. A conservative figure of 4 ETH profit across avg of 200,000 validators is only equal to 800,000 ETH in 2 years. Considering miners earn 13,000~ ETH daily equal to 4,745,000 ETH mined annually currently. We can see clearly even if ETH validator ETH will be a drop in the ocean compared to what miners are mining now.
Thirdly, the deflationary aspect of EIP-1559 coupled with lower inflation from ETH2 after merger which is expected after London hardfork in July.
https://hackmd.io/@timbeiko/why-1559 What we'll see is even lower supply of ETH and likely higher demand.
TL;DR - Miners currently produce more ETH than validators have locked up and will produce in 2 years even if all validators sold every drop of ETH they have locked up and earned it won't even be more than what miners mine in a year. Coupled with deflationary pressure of EIP-1559 and lower inflation rate of ETH PoS. We have a recipe of success.