So in other words, they tried an alternative, and found it inferior.
Because that is the only possible alternative. We all know that if a product fails it's because it was technologically inferior. There are no other known reasons or possible externalities. This is whythe x86 instruction set won: because it was better and all others were found inferior. This is also why Windows won over Mac/Linux/Unix, because these last three were found to be inferior.
In fact, many tried alternatives that they found inferior to X.
Except for NextSTEP, Android, OSX and Symbian, which are clearly superior, but hey, who's counting?