That actually significantly reduces any incentive to keep using the Diner's Club, which heretofore has been my primary credit card. I may dump all of my points out of it into IHG (still a partner), where it would be worth perhaps as many as eight free nights, use the nights on our road trip to Kansas City, and cancel the Diner's Club card once I reprogrammed all of my automatic payments to use one of my other cards.
I guess I'll have to go ahead and apply for an Amtrak Guest Rewards Visa and start accumulating points over there. The annual fee is lower, too.