What does he need to see? The entire World Government waiting for him to open the borders so they can invade and annex Wano? This plot point was over the moment the Gorosei said that keeping the borders closed was a smart move. Wano’s borders opening can only play a part at the very end when Momo in Wano has to support Luffy, opening the borders within the wrong timing, like that clown Oden wanted to do, had he defeated Kaidou, it would have been the end for them. Momo has already shown far better intellect than his father (not that it’s hard, but still) at the tender age of 8, his role as a main character has (finally after 10 years) come to an end, he now needs to study with the help of his vassals how to be a great Shogun.