It's specifically a Babel 6 problem - the way plugins are published means it now implicitly requires npm3. Similarly, I had to bail on installing the 'victory'

It's specifically a Babel 6 problem - the way plugins are published means it now implicitly requires npm3. Similarly, I had to bail on installing the 'victory' package (React visualisation components) using npm2 more than 600MB into it attempting to pull down its dependencies - I don't know if this is still the case, but every "victory-*" plugin was installing its own copies of Babel 6 and Webpack...