Putting aside my personal feelings about the spying that "Smart" TVs do on us...
The specific problem described in the article (a TV that won't work properly because of an app that you cannot uninstall), under Australian consumer laws this would not be a problem. I would be able to demand a fix, replacement or refund from the seller.
Of course, that doesn't help people in places with weak consumer laws such as the US.
In a more general sense, I believe it should be illegal for a manufacturer to remotely update firmware in a way that the purchaser is not able to downgrade to the exact configuration that it was at the time of purchase.
I wish our governments would actually work for the people.