The Sixers do not concern me. Embiid is too immature and Simmons is too easy to game plan against. Butler is probably their best player right now, but Embiid clearly resents that Butler came in and almost immediately took over the lead dog role. This doesn't appear that it's going to work out as well as they had hoped, and I wouldn't be surprised if Butler leaves this summer.
Philly will keep on beating the teams they should, but will also continue to struggle against elite competition. I'd imagine the Celtics would dispatch of them every bit as quickly as they did last season, were they to meet in the playoffs again this season.