To my way of thinking, we're just not in a great era for romantic comedies. 'Many' is a vague term here. How many? Not so many when compared to previous decades. From what I can tell the genre is dying a slow death. What's been taking over is a sort of adolescent, frat-house, bathroom-humor comedy.
Actually, it's superhero, thrillers, and other action movies that have taken over. I heard a piece (interview with an author who had written a book on the topic) on public radio that proposed a hypothesis, at least, about why this is. Romantic comedies and other slice of everyday life kinds of movies tend to have themes and humor that is very culture specific to the US and other English-speaking countries. But studios feel it's not enough these days for a movie to do well in the US, Canada, UK etc. The Russian and Chinese markets are quite important, and they love superhero movies as much as we do. They work pretty well with subtitles and for people who don't speak English as a first language because their plots are pretty obtuse and the dialog isn't that nuanced.
I'm guessing that raunchier, more juvenile comedies would also do better overseas as well. Not because people in other countries have raunchy, juvenile tastes, but because they're easier to follow.
This also explains why the number of women in speaking roles in movies has diminished in the last decade or so, since action movies tend to have male heavy casts. By modern standards, even a very popular (in the US) romantic comedy will be less successful than another type of movie. It's a frustrating issue. When a big studio does make a romantic comedy, it's usually released to far less hype and goes to video pretty quickly. Of course independent film makers and ones who are catering to a smaller audience are still out there, making movies of different types, but they can't compete with the big studios in terms of budget or volume.
I wish I could cite a link to the interview, but I can't remember the name of the author or book now, and when I do a keyword search on the pri and npr sites, it doesn't come up.