I think it's impossible to say, because a large factor into this collapse has nothing to do with oncourt ability.

If LeBron joined a team like the Hawks, there's a good chance half the team gets changed or traded as a way of succumbing to the pressure of winning now with LeBron and making a deep playoff run. How do the young guys there handle it? How does Trae react after a passive aggressive subtweet from LeBron about the roster after a loss? What if LeBron isn't happy with the coach, yet some of the young guys want him?

The problem with the Lakers is the same issues I think the teams like Hawks/Mavs/Kings/Suns/etc would all face. Teams that have long term potential and young assets that are developing chemistry with eachother without massive pressure or expectations, suddenly having to deal with an aging megastar on their team, and an organization suddenly trying to appease that megastars every wish in order to milk the remainder of his prime window at the expense of the rest of the organization.

The teams that would definitively be better than the Lakers right now when adding LeBron, are teams with developed chemistries and aged veterans in an organization is already built for a win-now run