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Sure they can upgrade and whatever. But from my experience, usually the projects that compromise on decentralization principles never ship anything useful in that direction anymore.

Once an architecture is put in place and people are hired, that's when a point of no return is reached.

Years ago, I've written about this effect in the context of deploying a dapp on a PoA chain: https://timdaub.github.io/2019/02/28/poa/

I'm not convinced they'll be able to create a rollup in any reasonable amount of time. The teams building this tech (arbitrum, starkware, zksync, etc.) are doing so closed source and stacked with people with deep applied cryptography experience. As far as I'm aware, Polygon outsources most/all of their development. Do you really think an outsourced dev team is going to complete in building bleeding edge tech at the limits of applied cryptography?

Matter Labs is launching their mainnet in August. zkSync.