Does this acquisition open up the market for a Linux company to move into the Linux enterprise space?

Maybe Ubuntu could pivot into this space.

Probably Ubuntu will be bought by Microsoft.

With the cloud, especially containers, there is little future in a business that involves paying for operating systems licenses.

Most interesting is probably supporting legacy versions of operating systems for customers who value compatibility to be able to continue to run existing applications with the minimum changes.

I sort of agree with this. Either Microsoft will purchase Ubuntu outright from Shuttleworth or they will just create Microsoft Linux, in whatever form that is, probably something more container focused than a general purpose OS.