Part of the point of that story beat was Clark having a crisis of identity. He couldn't reconcile Clark Kent, Superman of the JL, and Superman of the people. The point was for Clark to streamline all the identities. Clark Kent took on some of the slack of "Superman of the people," and Superman expanded his "neighborhood watch." Morrison has Batman shed a light on the possible future perception that people might have of Clark's big brother tactics if they were taken to their logical extremes. Morrison then has Batman prove that Clark Kent's pen beats out T-shirt and jeans fist in the long run even if Clark himself doesn't see it. Before this Morrison makes a point to expand the level of Clark's capabilities and he deliberately replaces Superman's issues. From men in expensive designer suits to alien transformers, intergalactic amber alerts, and he caps it of with a multidimensional double-talking demon in a designer suit.
I don't think Morrison even intended for Superman to go back and forth with his T-shirt stuff. I remember multiple interviews where he talks about how he simply wanted to depict the transition from folk tale to science fiction hero. The most I recall of him talking about a continuation was the idea of other writers doing stories in the past. As I recall Pak made a point to do that twice. It doesn't seem like it was ever supposed to be more than that.
I love the T-shirt stuff greatly, but I don't think simply updating that for modern times and running it on repeat would equal a long term win for Superman.