Well, with the reveal, it means it's nearing its end.
I thought this line of thought was faulty as a defense of perpetuating the single joke the series started on, and I still think it's silly now that the joke is over.
There are numerous comical romance stories out on the market that do not live or die on any one single joke built into their premise. Why do you think this one HAS to rely entirely on this one gag to continue?
It could continue on and be about them blundering through relationship challenges as a manzai comedy duo. Or Kanda could have to keep perpetuating the gender lie on Ookuma's parents in order to marry her, (or out of fear of reprisal) Or they could just be a cute lovey-dovey couple who gets into funny situations. Or a rival could show up that turns their world upside down, or any of a billion different comically oriented plotlines.
Agreed. While it did start out with the misunderstanding, it's not like the series depends on it to keep going. Hell, unlike some others, it's not even part of the title, so there's no need to worry about that either. It's just a story about a handsome girl and a sheltered girl going out, and even with the misunderstanding out of the way there's still a lot that can be explored after this.