They've got the talent. If they're going to be a bottom five defense in the playoffs too, then they're screwed. But I wouldn't bet against them to at least make the finals.
Yeah Dwight isn't a superstar anymore, that's why instead of making a contract in the 25-30+ range he only made 20M, just 2M higher than what the Rockets paid Anderson. Lowry and Millsap were never billed as superstars on the same breathe as Wade, Lebron, Bosh etc. and CP3's days as a superstar are done, he just doesn't know it yet. Who takes the Clippers as serious contenders nowadays?
To me, this is like when the Hawks won 60 games and people thought they were for real but they struggled against the Nets and Wizards only to get swept by Clevland. Same thing with the Celtics and Wiz this season. They just don't have that real star power and Thomas or Wall alone aren't enough to compete against LeBron, Irving, Love, Thompson and tons of role players of former career starter caliber. The Cavs will just walk to the finals.