Maybe this is a bit naive, but consider an equation of the form in Fermats Last Theorem $f_n(x,y,z) = x^n +y^n - z^n$.
Would it be possible to reprove Fermats Last Theorem by considering the Hasse-Weil zeta function $L(X, s)$ of the projective variety $X$ cut out by $f_n$ and analyzing special values on the left side of the right half plane for which $L(f_n,s)$ is defined?
Are there any conjectures/beliefs out there of such a proof?