The form of argument "maybe X invalidates theory Y, so we shouldn't trust prediction of Y" isn't terribly useful since it could be applied to any prediction of science; "Maybe quantum gravity so let's not worry about conservation of energy." "Maybe comoving frame, so maybe we can build antigravity devices", etc. Of course, it could be true. Most anything could be true. It's just not a useful basis for adjusting one's priors.