Yes, Microsoft had Windows Mobile Phone long before the iPhone and Blackberry.It's the nature of the OS market to want to consolidate around few operating systems, because network effects are the key to their vitality.
Without a large enough user base, you can't attract developers. And you can't attract customers unless you have enough apps and services (which require developers).
It's a chicken and egg problem that exists on such a scale that it is extremely difficult to solve.
Microsoft spent billions trying to buy their way into the smart phone OS market with the purchase of Nokia and paying developers to port their apps onto Windows Phone (which was pretty good) but they still failed miserably.
Both Blackberry and Microsoft failed to dominate the market. Actually, Blackberry took a nap and lost their opportunity.
Apple and Google didn't make those mistakes and are now the two dominant technologies.
Anyone else who wants to step up is welcome to do it, it's going to be a long road uphill, but don't try to lower the ones on top "to make it fait to the newcomers".
That's like those stupid parenting rules where all the children got punished because the baby spilled the cereal on the floor.