Both Co's would be dead by now regardless, its the way the operated at fault not the products. I dont think contemporary computing would be any different, just that that bit of the early history would be altered.
The 80's was all about proprietary, expensive closed systems - good riddance! I'm happy we now have inexpensive and plentiful hardware that is open to anyone to develop for.
I like standards but there are still companies trying to lock us into their proprietary Operating Systems and hardware solutions. There is one in particular that is as close to a vertically integrated monopoly as you can get.