The $p$-adic Riemann Hypothesis for exponential sums

Let $n$ and $d$ be the parameters defining the generic Newton polygon ${\rm GNP}(n,d;p)$ and the Frobenius polygon ${\rm FP}(n,d;p)$, and let $p$ be a prime. The $p$-adic Riemann Hypothesis. If $p$ is sufficiently large, then

$${\rm GNP}(n,d;p)={\rm FP}(n,d;p).$$

The paper presents this as a conjecture following Wan's asymptotic conjecture; the supplied context records partial results, including the case $n=1$ for sufficiently large $p$ and a special two-variable case, but does not indicate a resolution in general.