You could get it much closer to balanced. A good quality Netflix stream is 3Mbps down and probably only a few dozen kbps up. You just have to send some occasional bookkeeping data.
What if Netflix got that number to go up from say 30kbps to 500kbps? Still only 10% of upload speed link utilization on a 50/5 Mbps customer line.
Even if the ratio only went from 3:1 to 3:2 suddenly you're much, much closer to balanced. Takes a lot of wind out of their sails. Instead of "ZOMG THREE TIMES AS MUCH!" it's "FUCK IT'S 50% MORE!" which doesn't sound nearly as good.
But honestly, it couldn't be done. Not with the upload restrictions at the end of the pipe.