I think the better solution is a steep tax on the end product for any product containing at least one microprocessor which executes instructions from a mutable (even if "burned in") memory source, which totally and completely doesn't allow the owner to modify this memory with code of the owner's choice or authorship, with either physical or cryptographic mechanisms. All such devices should be treated as "rented" and not owned, and should have unlimited warranty which must be honored in perpetuity so long as a company exists (including future buyers of the company's assets).
It is a national security risk to allow commercial device makers to lock down the software on these devices and then abandon them in a few years. If in twenty years today's SmartTV has a network vulnerability discovered, the manufacturer (or whoever buys or merges with it) should be liable for updating the SmartTVs, unless it has made the device such that the owner can write and change the code at will.
This law should apply to cars, microwaves, smartphones, computers, washing machines, tractors, game consoles, etc. A twenty percent or more sales tax and perpetual warranty for "closed" platforms. Make it no longer economical to do business the way it currently is done!