Thanks for your feedback! Just a note to let you know that we’re building your suggestion now. We plan to increase availability to this feature as we continue improving the tech, and ensuring a smooth experience across Office 365 following the URL changes in SharePoint Online.Lars Henrik Juel commented
When we first registrered for Office 365 we had NOT settled on the final name for our company. Now 1 year later following a name search and evaluation process we have selected the final name, but can't change the tenant name. ugh... it is too cumbersome and risky to migrate to a new subscription just to change the tenant name, so we will be awaiting this functionality with much excitement.