that is to say "one day we won't need a batman,"
is an impossibility?

And we need to clarify here:
Am I to believe that Robin isn't becoming Robin, he is becoming Batman? Cause they put a statue up for Batman - wouldn't it be strange for somebody else to show up calling himself the Batman? Do you, Robin.
I honestly don't believe they were teasing another movie and that is part of the problem. It isn't coming, so why throw Robin in there? As OE pointed out above, Batman was GOING to come back, he didn't need the push from Robin. It was nice to see Bruce relating to other orphans but I neither needed nor wanted Robin to be that public face.

In TDK, the Chinese subplot is necessary for the plot in its way as well, but I am still bored by how much screen time that filler is given. At least Zac Snyder had the common decency to cut the animated sections from Watchmen.

I was entertained by this movie,
but I prefer to look back at a film and remember the things I loved about it rather than the things that irked me.