Microsoft has announced that Exchange Online and Outlook will soon synchronize email signatures across devices. Does this mean that the ISV market for email autosignature products is over? I don't think so because there's lots of other things to do with email signatures once device synchronization is handled.
Companies want to take control of employee email signatures to enforce their company brand. Making it easier for end users to sync their own signatures does not make if easier for the company to enforce their company brand in the daily email communications.
A company web portal or platform is required for central administration.