Seen from the perspective of the company that started the PC it was a failure. They were barely hanging on towards the end.
The Apple approach brought more money and success for the company following it.
You cannot judge the success of a business strategy, by the sucess of the product it spans if you make no profit from it.
The one that was laughing all the way to the bank was Microsoft, which IBM never had the intention was going to be the one who really got rich from the PC revolution. In this regard IBM totally blew it.
The only ones who really profitted from IBMs business strategy was Intel and Microsoft. Most definitely not IBM. They turned into the useful idiot.