Users didn't care either, companies used the opportunity.
When it was pointed to them, what they could have ("all the instant messaging in a single app"), the answer was a blank stare and a reply, why would they want that, they are perfectly fine launching separate apps.
If "the market" means "companies" then yes. "Users", not so much.
Much like Apple getting rid of Flash, if MS had a dominant market position they could have forced a user-friendly trend. Alas.