I'm one of the people who believes he will come back and still be able to perform at a high level. Maybe not 44/22/10 again, but still capable of averaging 20/10. So my issue isn't that people wouldn't want him in general, or in a vacuum.
It's just that most teams don't have cap. The teams that do have cap are either so bad that he'd never go there unless he was content to lose (Hawks, Suns, for example), or they're already on a path that doesn't revolve around giving max contracts to guys in their late twenties (Lakers, 76ers). Lakers are a semi-exception in that they would be happy to give a max contract out to certain guys, but Boogie isn't one of their top three aims (Kawhi, PG, Lebron) and if they can pick up any of those guys, their desire for Boogie would probably plummet; as would their cap space to get him in the first place.
But yes, for contenders, they either wouldn't want to give up key pieces of their teams (Rockets, Warriors), or they have no money to give to him (Wizards), or they have a totally different gameplan (Sixers). So I think we're his best option, and I don't imagine it would require the 5 year max to get him, although I'm not averse to discussing it if it comes to that.