The aim of science is to find the universal laws of physics. Both relativity and quantum mechanics are limited in their applications. And they contradict each other. In logic in only takes one counter example to disprove a proposition. Are you proposing that science throw logic out the window?
The graviton won’t show up. String theories are garbage science IMO. Even it’s proponents concede that to even begin getting useful results they need to fudge in an extra dimension, M-theory. 11 dimensions to describe a three dimensional, inverse square, phenomenon.
As I said, the hunt for a better theory is on. It's too early to say what that theory will be. But for about 60 years physicists worked in their respective fields and didn't talk to physicists in other fields. Those days are gone. Physicists from all fields are now talking to each other. And now physics must deal with the contradiction at the heart of its discipline.