The hangar module would have to be rewritten from the ground up. While I believe bringing back the hangar module is a good idea, it is also scope creep I don't believe we need. They did have "personal hangars" in the tracker and it was supposed to go with the cargo refactor, that no longer appears to be the case.
I can't say I don't agree but as has been pointed out by many backers of a certain level there was and renains an impression of a duty of care created by the initial expression of thanks of support which once offered has to be nurtured and maintained to continue a trusting relationship.
Consierge itself is a creature outside of its time. In the early 2010's spending big on a video game was super rare let alone backing one to this degree which had not even been made and could have failed (and still may). Now mobile games have blown it out of proportion and whales are not just more common, they are industry best practice.
Individual backers, even whales, are for the most part at best only 0.00X% of historic funding and if most are like you and I and are no longer reliably regularly contributing to the pot we are a drain on the projects current infrastructure, not a benefit. But that doesn't mean it will always remain that way and like you say may come out of hybernation once more of a game exists to interact with... to sour the relationship after so many years would be short-terminism looking for quick wins at the cost of future prosperity, which generally ends badly if it becomes a culture of never looking over the next horizon.
I think the first new PTU patch will prove if the new waves structure are a matter of hours or a matter of weeks. If it's hours this and the speculation around it all moot, it was a minor change anyway. If it's weeks, maybe months, then ways to resolve and maintain that relationship may be worth the Dev to maintain a happy and trusting core community. That dev would have to be aimed at making content which is low maintenance, low server impact while providing those backers the things they want without offering the whole PTU and the wider impact that has until loads can be balanced with demand.
AC's refactor is on the way. Later PTU Wave backers getting immediate access to their new stuff right away in AC Free Fly and battle royale etc might be a good step and even get people back playing that module, too?