The market is saturated in the sense that there are a lot of worthless projects with no future. Most cryptocurrencies are created as a means to enrich developers themselves instead of serving as an alternative financial system for the world. Providing real use cases to a cryptocurrency project is what matters here. But this is not an easy task. Prominent cryptocurrencies like Bitcoin and Ethereum have remained for long in the market because they provide real use cases for the mainstream world. On top of that, these projects are active in development and innovation. Given that the vast majority of crypto projects are useless, it's expected that the market will shrink to a point where there are limited options for traders to choose from. In the bright side, crypto's open source and decentralized nature, allows anyone to build upon abandoned projects for a good cause. The more developers work on adopting experimental features using Blockchain technology, the better it'll be for the evolution of this emerging industry.
In the end, people will decide whenever they'd want to use one coin from another. Mainstream adoption is what will determine the market's success in the future. We can have as many cryptocurrencies as we want, but only a few will be used in the real world. I think that the diversity of crypto projects help keep the ecosystem healthy. If it wasn't by that, Bitcoin and other major cryptocurrencies wouldn't have been robust as they are right now. New crypto projects are known to quickly adopt experimental features that could define older projects' future direction. As long as the space remains decentralized and open source, there should be nothing to worry about. Just my opinion