First of all, the AI doesn’t exist in 2015, so people could just…not build it.
I don't think that's an option. I can only think of two scenarios in which we don't create AGI:
It can't be created.
We destroy ourselves before we get to AGI
Otherwise we will keep improving our technology and sooner or later we'll find ourselves in the precence of AGI. Even if every nation makes AI research illegal there's still going to be handful of nerds who continue the development in secret. It might take hundreds if not thousands of years but as long as we're taking steps in that direction we'll continue to get closer. I think it's inevitable.