At this point, why not wait until you get it, then use it and see if you want to keep it or not.
What's the price difference between what you paid for the 2016 MBP and what you're willing to buy on the refurb store?
Don't forget that the new 15" has a faster chipset, dGPU, brighter more vibrant screen.. To be sure, it lacks certain things which may or may not be important to you but there's no reason to rush to cancel it.