Nah it's not that they ran out of ideas. It's that the market has changed and there's no room for risky mid-budget or high budget movies. Back in the day they could make a substantial chunk off of home video sales rather than just the theatrical release. Now streaming is not nearly as lucrative and they have to compete with a ton more forms of media. So when you're dropping hundreds of millions to make a movie you have to be damn sure it's gonna draw people to the theaters. So you take fewer risks and make things as wide as possible to appeal to everyone worldwide.
There was a really good 1 hour long YouTube video posted recently that broke it down