I presume that the reason they are still not offering TMN On demand is that TMN insist on offering that service free for TMN subscriber while Videotron, which is selling the service WAY cheaper that anyone else in Canada wants to offer it with a cost (like they do with Super Ecran).
Although I'd like to get it, and free, I'd rather continue paying less for the main service than them raising the price to have the VOD included for everyone, including people who wouldn't want it. I prefer getting a choice of taking a service or not, than being obligated to take it.
Remember that Videotron is the only company in Canada offering ALL their channels a la carte (except for basic channel and the ones that are regulated by the CRTC to be offered in bundle). Everyone else has some channels that only comes in packages and I think it is great that they insist on offering all the services a la carte so people only get what they want.
Now I would really like TMN to let Videotron get it and charge for it...