Yep. String Theory leading onto M-Theory … unproven and with even more data, it may still be unprovable .. but this may not mean that it is 'untrue'.
The point to be made here is that (Godel's incompleteness theorem about Logic):
"No matter how large you make your axioms (logic bases), there'll always be statements that are true but cannot be proven to be true .. no matter how much data you have."
This may or may not be the case for String and M-Theory
Astronomy provides the data. Without the theoretical context however, it is simply data. Humans need a context to make sense of the universe. 'Tis a symbiotic relationship .. one can never be real without the other. Intuition, or dare I say it .. 'faith' often bridges the gap.
Judicious forethought and caution is paramount in this approach, however.
Cheers