I'd imagine the Lakers make at least one other minor trade to clear up the logjam (Caldwell-Pope?), because they already had too many veteran rotation types, many of whom are volatile.
Prince is closer to a slightly bigger Snell than he is a true 3 and D wing, but he's not necessarily a finished product and still easily the best realistic option.
Forbes and a 1st likely gets it done, but they don't have the balls to make that type of trade in season. Maybe in the off season, but he could be gone before then.
Think there's an outside chance they trade for Johnson, but I expect nothing as usual because they're probably too concerned with their precious culture and "system" to alter their mighty fringe playoff team.
And before you bring up the draft picks, they'll just be hoping to select someone with the profile of one of them and even if successful, by the time they get them up and running, Aldridge and Gay will more than likely be past their prime.