First off Kudos to Aaron and the current development team for finally listening my constant suggestions ( in various forums) for a licensing change and start the process to change the license for eventual commercial use.

The new licensing would aid the current developers in two separate ways. Their code can be used in furthering commercial projects, and dodge the legal bullet that can be fired from any copyright holder. Also when the time comes, the code can be submitted to the Library of Congress, and fulfilling the archiving role than the "arcade ROM Player" as it is commonly associated today.
The second benefit helps the developers to create an arm of technical support which can feed new archiving projects, without resorting to the questionable methods employed in the past. This technical arm would be a great way to liaison with organizations that may have copyright ownership (opening up doors of communication to resources), or to assist larger companies like Nintendoh or Sega for their nostalgic reboot programs.
The "Owner" of MAME could be construed as the one(s) who coded MAME, which can be traced and linked to the project. The MAME domain name was linked to an address in So. California (last time I checked) so whoever owns the domain name and can demonstrate that they worked on the project could have legal rights to the entire code base and IP.
It is all fine and good for Haze to object it, but he doesn't helm the project any more. I do think he has a say in the licensing change as he was a major contributor for many years but had fallen out of favour. The MESS team would definitely see some benefit, and existing emulation code could be easier to obtain and assimilate.
I think it is the way to go, and it will change MAME in a positive way, and become more beneficial for the community and kindred intellects that are focused on the preservation side, rather than metamorphosing into some muddled legal and technical mess that would eventually kill the project.
Anyone will be able to take a fork of MAME and make some money supporting it. I bet Digital Leisure would make some cash out of those tired IPs yet again.