It's way too early to make a judgment on the success or failure on the Sixers' tanking experiment. They've just started Year 2 of a long-term rebuilding project.
MCW isn't a star, but he won ROY last season. You can argue that his winning ROY was simply a function of a high usage rate resulting from playing with a bunch of scrubs, but his efficiency is going to catapult if he's ever surrounded by legitimate NBA players.
Noel is six games into his career. Even if Embiid were playing this season, at this point you couldn't say whether or not he's a star. Same goes for Saric.
In the second year of Sam Presti's rebuilding project (also Durant's second season), OKC started out 3-29. Everyone knew KD would be a star, but you couldn't say the same about Westbrook just two weeks into the 2008-09 season. Ibaka was drafted in 2008 but didn't join OKC until the next season. Harden was drafted a year later. OKC's tanking project worked in large part because they started out with KD, but those other guys--all of whom were of unknown value as NBA players at the beginning of Presti's second season--were a huge part of OKC becoming a contender instead of a lower-seeded playoff team.
I do think there is a legitimate concern about whether taking it to this extreme--the Sixers roster consists of rookie-scale players and a bunch of D-League quality players--will poison the culture of the organization and its young players. OKC at least surrounded its young players with legitimate NBA vets. The Cavs weren't trying to tank, but you can see the bad habits and mindsets that were developed by the younger players in that losing culture.
The Sixers are obviously tanking this season, but after the 2015 draft, they'll have accumulated five lottery picks (Noel, MCW, Embiid, Saric, 2015 pick) in three years. At that point, it's definitely time to start trying to win and seeing if those guys can produce when surrounded by real NBA players. Next summer they need to acquire enough NBA-level players to field a semi-competitive team.
Hinkie's tanking project may very well fail miserably. There's no surefire approach to building a contender in the NBA. Philly has a lot of promising pieces, though.