It happened with routers, the OpenWRT project is a result of GPL enforcement against Linksys. There is no reason the same can't happen with TVs and other devices. If the company can't comply with the GPL, then at minimum the lawsuit could be transferred to the suppliers, or at worst the company can stop using Linux and other software they violate the licenses of. There are plenty of non-copyleft or proprietary projects they can use too. Whatever software Vizio use that isn't subject to GPL requirements can be rewritten or replaced with other components. The main thing is that the GPL code get released.