I have a number of friends and family that I would encourage to switch to TS if I could set up a VPN between us and have any traffic NOT be charged to BOTH parties (upload+download).
From a marketing perspective, this would have similar advantages to Vodafone's "Best Mate's" phone feature, encouraging associates onto the same network.
And from a business productivity point of view, I believe it would ACTUALLY increase productivity and innovation (unlike the silly claims that UFB/TV-pipe will! :p)
Besides considering a Broadband unlimited plan, I seem to recall one ISP that offered a "Pay an additional $20 for unlimited national traffic".