No. Each company dominates in a certain field. When it comes to enterprise, the desktop, and possibly the cloud if things continue as is, that's MS' field. Mobile? That's all Apple. Though Android beats them on pure marketshare, there isn't a single phone or tablet out there that's as widely regarded or as solidly selling as the iDevice line. Google? Consumer oriented internet services. No one touches them there.
So everyone dominates in something, though no one dominates entirely anymore.
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Carpenters would've replaced hammers years ago if it weren't for their inertia.
With what? WHO KNOWS! But I'll tell you this: no one wants to use hammers because they want to.