I'm assuming that with 7 PB's in the top-14, it was a good day for relatively fast times.
Former WR-holder Makau, running 'only' 2:08 in a fairly evenly-paced race with a pack he could run in for >50% of the time, probably means he's never touching anything close to the WR again. The better question is, can he win Boston, New York, Chicago, Berlin, London, WC's, Olympics? Does this win put him back in line for big-time appearance fees at those races? Obviously he's not getting a fee to run the Olympics or WC's. Or does he decide to be a headliner on the almost-top-tier marathon circuit? Considering Meb just won Boston, and Makau is known for fighting hard for some of his wins, the answer must be yes, he can win, or runner-up at a WMM race, but probably not London, NY, Berlin, or Chicago (i.e., maybe he could win Boston. Those other fields are just too deep with 2:02-2:05 guys, which Makau doesn't seem to be anymore). He would need a fighter's race that doesn't require sub-2:04 wheels. As for appearance fees, I don't know enough to say what he can demand relative to people like Geoff Mutai, Bekele, the tiny guy from Ethiopia, Kimetto, Kipsang, Meb, etc.
Winning Fukuoka is great for a guy like Makau, don't get me wrong. Surely this will be oft-forgotten, but Makau is a Kenyan hero because his performance reclaimed the men's marathon record from Haile and Ethiopia. He did it in awesome fashion, a man-on-man 'slaying' of Geb en route to the record. All the Kenyan success in the marathon since then (multiple world records, WC's, world-best times and unprecedented elite depth), was spearheaded by Makau's practically and symbolically heroic performance.
I believe I'm correct that Makau comes from a bit different ethnic background and neighborhood from many of the top Kenyan runners. Whomever is his agent could probably try to market this somehow, though Makau's personality is a bit difficult to market. He may have beaten Geb, but at this point he's sure no Geb personality-wise.