I wouldn't mind.
In fact, I wouldn't mind if Marvel Studios kept this thing of showing the 1st trailer for the next movie, in the current movie, like NWH.
It could become like a appointment thing.
Like... the 1st trailer of Black Panther in the Thor 4 post credits. Because most post credits are a bit redundant. The mid credits scene is always the big one.
So making the post credits scene the place to see the 1st trailer of the next MCU movie is awesome to me