I think a key difference with maidsafe is that they are building foundations for the future. They are creating a framework and a platform.
I suspect many of these other projects are interesting and some may even find a niche. However, something needs to draw them together to be truly useful. For them.to be a marketable product, they need a stable platform to operate from.
This reminds me a bit of web technology evolution. At first there were no tools other than basic editors and static content. CGI scripts bolted on to servers to provide basic dynamic content. Then came the simple scripting languages (asp, php) and they helped to create decent interactive sites. Then came the template engines, followed by the frameworks and now we have whole applications (.net, java, php) using sophisticated MVC frameworks (spring, symfony) running on cloud infrastructure (IaaS). We even have whole platforms integrating IaaS with software to create PaaS.
I see these various one off techs as being on the early part of this journey, but I maidsafe extending the end part of this journey. Different ambitions and implications, for sure. However, I see a market for integrating clever new functionality in a leading edge platform. I am not so convinced the other new crypto techs will progress beyond curiosities.
Of course, the challenge for maidsafe is the scope of what is trying to be achieved. Creating such a platform - which replaces big chunks of what Amazon, Google, Microsoft, any many other do - ia anhuge undertaking. Some realise this and are scared off, while others moan that is wasn’t finished yesterday like the other crypto curiosities. On the bright side, I believe maidsafe are doing an admiral job of handling this huge undertaking.