Yeah, there may be some mileage in that. The IG has been through a lot of power downs (that horrible showing where it was on a par with a GL battery in JLAvengers, the fact that it is not multiversal, superseded by the Heart of the Universe etc).
With the movies, maybe it will finally come back to what it was before.
Just a guess but Doom may have been limited by his inability to effectively use or control all the higher planes of power to the full extent. That has been a problem for him whenever ultimate power has come under his control. That would be a call back to the original Secret Wars.