Those Sixers won 65 games, dominated the playoffs, and then never made another finals, and only made the conference finals once in the next 8 years (lost in the first round the year after winning it all).
GS has a major salary crunch coming up this off-season. They're either going to have to remake that roster bit, or be willing to pay $20-25 M in luxury tax for a season. Not sure ownership will do that. Of course, maybe they can use Barnes to dump Lee, and then split up the salary exception with some vet guys who come in a flourish in the scheme and with the space Curry and Thompson give them.