Agree. Decentralized cloud storage services will survive a lifetime thanks to their open source and distributed nature. But in terms of mainstream adoption, centralized cloud storage platforms will still be the winner. Let's face it, decentralized solutions are still experimental and not ready for the whole world to use. Even if they were production-ready, they wouldn't be as comparable as their centralized counterparts because of their "steep learning curve". It's much easier to use a centralized cloud storage service than it's the case with decentralized ones. Only people that are tech-savvy and are looking for censorship resistance, will use decentralized cloud storage platforms more thoroughly. The rest will continue to use centralized cloud storage providers such as Google, Dropbox, and Amazon.
Nonetheless, it's important to know that decentralized cloud storage platforms are just starting to blossom. They have a long road ahead of development and innovation. There are many issues that must be "tackled" (especially performance) for decentralized cloud storage platforms to become as comparable as centralized ones. Platforms like IPFS, Sia, and Storj have done a good job so far. I'd expect the space to mature within a couple of years from now. Just my thoughts