He talked about this 8 years ago on Reddit: https://www.reddit.com/r/asoiaf/comments/4uwjq9/spoilers_everything_twow_isnt_coming_this_year_is/d6lotl1?context=3
He agrees with you. It's not his style, he doesn't think he's the right person for the job, and would decline if asked to do it.
And to the point made by @Albbi@lemmy.ca, at the time he had only read the first book so it doesn't seem that he's in the "huge fan" category.
Maybe something has changed since then but I really doubt it.
I should have worded that better. I meant that he's not a huge fan of ASOIAF so it's quite different from the WoT situation.