The elephant in the room is the iPhone, where "circle of one" seems to be working extremely well. Maybe the model just needed some fine tuning.
All of those issues are precisely because the Macs were proprietary. If they hadn't been proprietary, none of the issues that made them lose to PCs would have been issues and they may have won the war. In the 80's, every school bought Apple IIe's, so they had the foot in the door.
Then, under the leadership of Mr. Jobs, apple slammed the door shut on their foot and here they are doing it again -- also under Steve Jobs.
Steve is the problem. Eventually, they'll realize this and fire him again when people get tired of his antics.
Going back to the subject, before Steve came back Apple tried the MS game where they licensed everything about the Mac (from hardware to software). This strategy failed miserably; most likely because they were already too late.
Fast forwarding to today, Steve is not the problem. He is the main reason Apple is wildly successful today. If he didn't return and revive Apple with the products under his watch, Apple would most likely be gone. Saying Apple is not successful is like saying BMW isn't successful just because it doesn't sell as many cars as either Ford or GM.