That would definitely be a great feature. But the space for keeping the data stored isn’t free so you would have to pay for it. On other plattforms (like MyRoute-app) there are a lot of poeple who are not willing to pay for such a service. And you’ll need an appropriate frontend for managing all your routes.
After all I’d prefer if Robin and Emux concentrate on making Kurviger website and app better with every new version. In my opinion that’s really enough if they offer a good interface to a common cloud service, so that everyone can organize his routes with his personal system.