Frankly, whether S/V was commercially successful or not, I don't think it would have any bearing on the technical performance of GF's next release.
Like, I seriously have no expectations from them as developers, between their technical skills, their dev cycles, and their need to coordinate with their massive multimedia machine.
And overall, it bears repeating that those glitches and bugs and frame drops are all minor niggles to the vast majority of the audience.
Do I want the games to perform better? Absolutely. I just don't see how good sales necessarily run counter to that.