It's also wishful thinking. If IBM had controlled that, there wouldn't have been a big enough ecosystem around the PC platform for it to become the winner. IBM also tried to grab this back with PS/2 and OS/2 which also failed.
It's interesting to compare this to another article linked here about the downfall of the TI home computers. Apparently TI understood the value of software to the point where they threatened to sue unlicensed software vendors, which pretty much guaranteed that those vendors chose to write software for other platforms. Perhaps they would have had a better chance if they had opened up their platform?