Actually I wrote an article about a huge conglomeration of cryptocurrencies... Well, that was a tangential point anyways. There are two technologies listed in that article that would greatly help this idea. And besides, if we had a bunch of cryptocurrencies working together, it would also solve the scalability problem quite nicely : ).

Here is a link to that article if anyone would like to read it.

https://steemit.com/cryptocurrency/@trucidus/smartbridge-vs-atomic-swaps