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We mandated UHF channel reception for televisions (https://en.wikipedia.org/wiki/All-Channel_Receiver_Act)

I believe that mandating AM reception is perfectly reasonable - as the reason given for leaving it out is because auto manufacturers do not want to spend the money to reduce the EMI from their vehicles.

The total added BOM cost to add AM to a modern radio is zero - because they have a single chip that does both AM/FM.

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Does that also mean that those cars could potentially be responsible for tons of interference in the AM band in the future?

My belief? yes, it does. The motor controllers are noisy.

If so, it's interesting the FCC hasn't stepped in since nearly all electronics need that certification.

There’s two types of electronics you’re referring to. There’s incidental radiators, like electric motors, switching power supplies, etc that the FCC understands that RF will be generated from, and they ask that these devices merely minimize their RF.

Then there’s Unintentional Radiators which is probably what you’re thinking of, which include computers and other electronics, which are regulated to limit RF.

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