I think it is human nature for people to cheat if the cost is small and the reward is large.

I ask myself, was it costly for big blockers to fork the chain to get BCC? At present I can't see much cost on the big blocker side. Maybe a loss in reputation for the moment. The reward was immense. They already got their optimal/profitable version of bitcoin that they can put their 100's of millions of equipment towards. The cost/reward explains why the hard fork took place despite the consensus to do segwit2x.

Then the next question is whether the big blockers will pull their resources from BTC. The cost would be another stain on their reputation, public outcry, the market would take a hit as BTC grinds to a halt. Since BTC doesn't have difficulty adjustment like BCC a sudden pull back by big blockers will not end well. The rewards are immense for them. Their version will moon and replace BTC as Bitcoin and they can profit and dictate Bitcoin's future, no more appeals and consensus reaching with Core devs. The cost/reward does indicate to me that this has a good chance of taking place.