As I am a member of the W3C Advisory Board, are you asking for the AB to review this to provide an opinion? I am happy to ask them to do so, or any W3C Member can create an issue at https://github.com/w3c/ab-memberonly/issues. Feel free to email me, cwilso at google, if you’d like me to file it instead.
I should preface this with: I’m a member of the AB, but not speaking for them; I’m Google’s AC rep, but not (in this instance) speaking for Google in regards to the actual proposals, as Michael is better informed. I’m a co-chair and founder of the WICG, and do have some role in speaking there, along with Marcos, Yoav and Travis.
The point of incubations is to let multiple potential avenues be explored, in the open. There have been incubations that “compete” before (conversion metrics comes to mind), there will be in the future; that’s by design. Incubations do not represent the consensus of the entire community. Community Groups and Business Groups both are not suited for representing such, as they are not do not function under the W3C consensus Process. Any incubation developed here would be expected to move to a Working Group in order to represent the consensus of the W3C (which would represent a blend of user, advertiser, developer and vendor needs).
I would point out that Michael’s expressed goal in bringing this here was to bring this area to the attention of more than just the membership of the Web Advertising BG - not to remove it from the view or engagement of the WABG. This work should eventually move into an (as yet uncreated) WG at the W3C, I would expect, and would have to do so even if the WABG had reached a complete consensus among themselves on a precise proposal.