I was kidding. Free
If you are entertaining this as a consolation, make sure there is not a time provision attached to the 100,000 miles.
Beyond that, they are taking the low risk (cost) path (for them) to make you simply go away. I am an ASE Master Mechanic. Your engine's useful life has been compromised ... how much ???? ... how many miles of equivalent wear occurred ???? ... was anything damaged to where 100,000 is possible but beyond that who knows ????
The bottom line is that every time you turn the ignition key, you will wonder "is today the day" the engine will start knocking ... "is today the day" the engine will spin a bearing ... "is today the day" the engine will start burning oil ... etc ... etc.
You did not pay top dollar for a new vehicle to have this looming over your life. For me, this would drive me crazy and is enough to pursue what the dealer should offer ... a new vehicle.
For me, anything less would be unacceptable.
If they need to save face with their regional manager or factory, then have them give you a trade-in value and pricing on a new vehicle to where you come out whole.