Imagine if the gasoline companies one day announced that they will be changing gas so only cars bought in the last 5 years or so could refuel.
They've already effectively did this, and by they I mean the US government mandated it. 5% ethanol has been mandated since 2006, and 10% since 2012. If your car is too old (lots of 90s cars) you'll have to find a gas station that has ethanol free fuel.