Unless it can be infected using the stick as a proxy (though I haven't seen that as a possible vulnerability yet).
http://boingboing.net/2016/11/09/a-lightbulb-worm-could-take...
I would agree odds are low of something that insidious... but it's hard to say "it'd be impossible for my TV to get hacked" when even light bulbs are getting attacked.
Although with the way I've got my house wired, HDMI over Ethernet would be more useful.