There are plenty of reasons why it didn't work out, and none of them are especially surprising. The plan has not yielded the kind of returns the Sixers no doubt hoped it would (i.e. they haven't become the Thunder yet) because they didn't have good luck in the lottery.
Yes, they were not surprising. That's exactly why people act the way they do. So, you agree his eventual firing/resignation was inevitable and the right choice, given the evidence at hand?
Despite that, I think it's far too soon to have judged "The Process" a failure because most rebuilds are going to take a lot more than three years to come to fruition, especially when the starting point is as bad as it was for the Sixers.
That's all well and good (and awfully convenient for Hinkie), but his downfall wasn't in the hypotheticals, his downfall was what he actually did. Like, draft 3 Center prospects in a row, or trade away players who could become solid rotation players for basically nothing, as Lucky17 pointed out.
When Mbunge says Hinkie's plan consisted of
1. Suck
2. Get Lucky
and that he had no alternative, he may be oversimplifying things, but he is nonetheless factually correct, as that is exactly what Hinkie did. Whereas Ainge, for example, has many different routes he could pursue to bring us back into contention. The fact we're in this position didn't fall from the sky, either, we worked for it and paid a price to get there.
People act as if trading Pierce and KG wasn't a big deal. It was an enormous risk at the time, even if you believed the trade was the correct move. We could've just as easily kept the guys together and go for another playoff appearance and a 2nd round exit. People wanted to burn Ainge at the stake when he made that deal, calling him a snake, a traitor, and a despicable human being (and everyone who was for that trade). You think the labeling was bad when people wanted us to tank last year? That's nothing compared to back then. Some are still calling him that.
And it's not just "the trade". Heck, people went crazy when he traded Perk, another highly risky move that lead to us having the Memphis pick. He signed Brad Stevens as a Doc replacement, a young, unproven college coach. There's a long history of highly touted college wonders who never worked out in the NBA. He traded Rondo for Crowder, a Mavericks bench warmer. He traded for Isaiah Thomas when everyone and their mother wanted us to all out tank.
Ainge (the FO) paid a high price to get us were we are right now, not once, but several times. All Hinkie did was to chose the easy way out and preach blind faith in the ominous "process". There is absolutely zero evidence to suggest his plan over the last three years consisted of anything more than 1. suck and 2. get lucky, indeed.