Will MTS be changing the primary alias policy on our Microsoft accounts?

With the recent announcement about the move off Microsoft mail, I looked into the issue with Microsoft and for those of us who want a single sign in solution (basically, everyone using windows 8) it would be really easy to simply create a new alias and use that as our primary alias.

However, when I went to do this, on the account management page with Microsoft, there is a clear message beneath the primary @mymts.net alias stating:

Will MTS revoke this policy globally, or will we each have to call in and get it manually done, or are they simply planning to force us to continue to use the @mymts.net alias thereby having to use more than one email service?

Hopefully, there can be an answer soon, so that those of us that have literally hundreds of dollars tied into our MS accounts through subscriptions and xbox purchases etc can make a plan.