Also i dont see a scenario in which miners would vote out their own business model.
Technically,
they can. Also, the Lightning Network is based on Proof of Stake. There is no mining inside LN. That means, it is technically possible to transform Bitcoin into Proof of Stake coin, and give users some choice. So, a "coin in a coin" scenario is possible here and now, it is just a matter of pushing things higher, and turning the on-chain consensus into that.
Are there any downsides/benefits in doing that? Im just getting into how exactly lightning works at the moment and didn’t go into merged mining yet. Does someone have any good resources to catch up?