That's not true... there's plenty of creativity left out there, an hour on youtube proves that. The problem is remakes are 'safe.' Retold ideas are low risk and often come with a built in audience (how many of us went and saw batman begins or will go see GB because we loved the previous batman or ghost busters flicks?). And Hollywood has become substantially risk adverse. Rather than telling hundreds of small, well told stories each year, the entire model now centers around the fact that there's 52 weeks in a year, and there can only be "one big movie" for each of those weeks. (maybe less for a REALLY big movie like Avengers that might "stay on top" for two or three weeks) And so, using this top heavy approach, well, you don't want to float your studio's ass on a two hundred million dollar action movie or a seventy million dollar oscar contender, so you take the safe bet wherever you can.
and then it becomes a self-fulfilling system. if that's the only movies you're producing, those are the only movies people will/can go see. and if those are the only movies people go see, then the numbers grow in support of making more of them, kind of like how if all you're selling is hamburgers, then your hamburger sales look fabulous compared to imaginary hotdog sales. And the slide into mediocrity only accelerates because so many smaller theaters have been killed off by the switch to digital projection, so there's no market for anyone who might want to show art house movies, or dollar shows that have been out for a few weeks, or marginal pics that exist between art-house and big cinema.
it's a sad slide based on a largely broken understanding of how the film going economy works. (one that largely mirrors how reality tv has chased scripted tv off the air on a lot of stations, thankfully in that case the internet is starting to fill the void)