I think it is the opposite.
Having a Mercedes engine is a good move, they are very stable with no problems and a lot of power.
Even a second hand engine from them will be better than one created by Renault to be honest.
Maybe now we have too many Mercedes engines.
Mercedes engines are use by / will be used by
Mercedes 2030 and beyond probably
McLaren 2030
Aston Martine 2025 -> they will go to Honda
Alpine 2030
Williams 2030
What I mean by instability is not the engine, but from the side of the workers. Regarding the Mercedes engine, we don't need to question its stability anymore, McLaren is one of the proofs of how if a team with an engine from another manufacturer can achieve good performance, even exceeding the team of the engine manufacturer. But this is an internal matter of Alpine whose employees from the engine development side clashed with the decision - but maybe it just takes time for them to adjust to the Mercedes engine.
Not even "Formula E" is capable of this, since it has already been proven that the process for manufacturing batteries is as polluting, if not more so, than a combustion engine in its entire lifespan.
Shut that carbon neutrality. I just wish F1 could bring back the V10 and get rid of all the ridiculous rules and make F1 look like Formula E. They should understand that what the F1 audience needs is the sound of the F1 engine, not making it more electric.