This franchise doesn't need one's support if one thinks the films might be bad, either.
We hit some real low points in terms of ticket sales, then they picked up massively with Prometheus. Covenant was disappointing financial, but we're getting Romulus.
One doesn't need to financially support projects they think they won't like out of some notion of keeping the franchise alive. The franchise will persist. One can let movies they think they won't like fail - or at least, not support them.