In the 80s/90s Arnold was a huge movie star, playing huge men in both serious and comedy roles.
I guess that what I am asking is; what actor today could occupy the same kind of decade defining place as Arnold did in the 80s/90s?
They don’t have to be a massive bodybuilder, but they should be the first name that anyone would think of when someone say “2010s/2020s”.
If I’m understanding your question right, the 2010s were fairly dominated by marvel’s movie machine, and RDJ was probably the stand out lead of those films, though Samuel L Jackson is the highest grossingactor of that decade i think. RdJ has now garnered the critical acclaim in the 2020s that was missing, so there’s a reasonable chance RDJ could be the man you’re looking for. Leo DiCaprio is the most revered critically over the same period I think, of leading men in highly rated films. Though Tom Cruise, for whatever reasons, is really the last of the real Moviestars, but his career spans over the earlier period too of the 00’s and even 80s, & 90s.