My case is a little special because I developed the WiX Toolset when I was an employee at Microsoft. I never owned the copyright (Microsoft did). So, I wouldn't be asking for the copyright back... I'd be asking for it for the first time.

And there are advantages to a legally well protected entity holding the copyright. One for example: my company (FireGiant) is "firewalled" from certain legal issues.

So I'm still contemplating the future and don't have a real answer for you yet.