Unlike with employers and real world unions, the Ethereum network is not bound by labor laws to negotiate exclusively with unionized miners, or refrain from replacing them with non-unionized miners. Without those laws, unions are pretty powerless, which is why the late 19th century had such low unionization rates.
>>I hope the miners get their due, because it was the initial philosophy of Ethereum.
The initial plan of Ethereum was to launch with Proof of Work, and very quickly afterwards switch to Proof of Stake. Miners have already gotten much more time to earn from ETH issuance than was originally planned.