That's not the main feature. Ripple perfectly demonstrated that it can be deployed and used in a centralized manner as well. It has for that exact reason (i.e. due to being centralized) managed to attract a wide field of interest from major financial institutions and services. At the end of the day, it's just that our personal preference goes towards decentralized crypto currencies, and that's obviously rightfully justified. Main point of importance is that any entity can for itself make the choice to use or to ignore a certain initiative/proposal, and that's a very strong characteristic of the freedom we enjoy right now. As long as you have the freedom to choose, and that's what our decentralized currencies offer, no one will be forced to use something he/she doesn't want to use.