While I won't know what's in a particular King novel until I read it, and my hope is that I'm wrong, I think it comes down to how successfully he can keep his Twitter feed out of his work, and based on bits of Elevation, The Institute, and the Hodges trilogy, I'm concerned that he might not.
For the record, I would find it just as dull if I shared his positions (I don't want characters to slap each other on the back and compliment each other's MAGA hats).
Normally I wouldn’t expect passing references to be obtrusive, but I’ve heard from someone who started Billy Summers that the 5 Trump references he noted in the first 57 pages caused him to stop reading it (at least temporarily).
I would be very happy to be proved wrong about Billy Summers.
I agree it stands to reason that writers will tackle it, but I doubt his ability (or willingness) to do so without politicizing it (he almost certainly will pick a bone with someone, and it ain't going to be China).
I would be very happy to be proved wrong about this future novel.
Specific occasional jabs are one thing; ongoing fixation with the specific individual about whom his side of the political spectrum has obsessed for 6 years is another.
Homophobia isn’t political (those who disagree on gay marriage agree that violence against gay people is unacceptable); it only becomes political if/when one side tars the other with imagined support for it.
The Mellon incident was notable and informative in the context of It because of what it said about Derry (willingness to ignore witnessed horror, primarily the widespread disappearance of children - also apolitical, unless some thought conservative readers rooted for Pennywise) and what it said about those who attacked Mellon (who acted on behalf of their twisted ideas about, and their insecurity with, their masculinity - not on behalf of the Reagan agenda).
While abortion battle lines do tend to follow political positions, as you note, those that attacked the clinic didn’t do so because they were conservative, they did so because they were terrorists (not to mention under the influence of "higher level beings" that manipulated characters in order to ensure the death of a particular character).
All of which is to say: while King has done a good job involving and examining social currents in America through things like Mellon, Susan Day, and others, this isn't what readers like myself are referring to.