As a huge comic nerd who frequently manages to drop more on comics than figuarts in a given month, I've thought about this a lot. I think most Heisei era series would adapt extraordinarily well to comic book form, given the right team. For example, W would need a terrific artist like JH Williams III who can give it a bright and vibrant look while creating a noir feel at the same time. I'm thinking of his work on Desolation Jones specifically as I type this!
Something like Decade might have actually worked better in comic book form. My absolute favorite writer, Grant Morrison, does these re-constructionist stories, where he breaks characters down to their core and then builds them back up again. I feel like that's so in line with what Decade tried to do, and I'd love for Decade to be able to take its time and keep telling its story for an indefinite amount of time.
I actually can't think of a Heisei era series that wouldn't make a good comic, and I've seen them all. Haven't seen all that much Showa stuff, but I can definitely think of some series that'd be much trickier to adapt to the comic format.