The 'global event' is a really interesting idea to me - it's easier to meet & chat to new people when you've just had a shared experience, more so if it's co-op rather than competitive.

Wow, if Niantic had an event on the waterfront, and they happened to get city permission so when the sea monster is defeated it triggers a local fireworks display, that could be really interesting - and newsworthy. And no doubt the local cafes and food vendors would be selling out again afterwards too if you can create an event like that....