I think Nu needs to work together with other coins to create a wider ecosystem. And yes, we need to ensure that our ecosystem talks to the others in some way or the other to be viable. In think the facts that we are working with and supporting Peercoin and Blackcoin community with supporting their exchange are already steps in the right direction. The adoption by shapeshift.io was another great step to integration with other ecosystems. There are still several areas the Nu ecosystem doesn’t cover (see Vitalek’s great graphic). Maybe it is time to look at them (contracts, identity, data storage etc.) and see which areas we should work together with others or integrate and which areas we want to focus on and develop ourselves.
I think the time that single crypto currency communities survive is over (except some niches), 2015 will be the year of consolidation into crypto currency ecosystems.