At the moment, Bell has 43 HD "full-time" channel slots for an Eastern, or Western, viewer. TMN + MPix are for the East; MC1 + MC2 are for the West.
Also, while Bell has about 5 French HD channels, how relevant are those in the West? How relevant, in fact, in the East except in PQ and parts of ON and NB?
You simply can't squeeze 65 channels out of a 43 channel universe without making some major concessions.
As pointed out, almost all broadcasters, except ABC and FOX, are sending out 1080i HD signals; yet Bell ExpressVu happily downconverts to -- or at least mucks about with the signal to reach -- 780p in most cases. MPEG-2 requires about 19 mbps bandwidth to deliver 1080i; all Bell HD is MPEG-2; Bell has around 13 mbps per channel available; this is the reason is prefers the lower HD resolution.
There are three transponders on Sat 82 not in use last time I looked; perhaps these can be lit up with the backup satellite to deliver 6 more HD. CBC West HD has been promised; what will the other five be? Videotron has several French services Bell doesn't carry; Rogers has several English services Bell doesn't carry; and Movie Central might like to add a channel or two. And High Fidelity has received licenses to create more programming loops of pretty pictures of "How I Spent My Summer Vacation" and "Basket Weaving for Pros"; I wonder if they will use up bandwidth for a few more of those?
Bell has said it: MPEG-4 transition requires a significant number of MPEG-4 receivers in customer homes and that won't happen till 2009. A new satellite is set for 2008, but that replaces the current 91 bird which is ready to retire. The next satellite in 2009/2010 might offer a third set of signals at 72 but no one has said if Bell has EXTRA spectrum or if this has to be shared with the 91 bird, for example, to create an East-West set of signals catering to more local audiences.
Count any way you like: take off your shoes and socks to help, if necessary. But until Bell upgrades to 8PSK or MPEG-4, there is no quick fix out of the approximate 43 channel per East/West customer box. 65, 100, "up to 150", and beyond is a mirage.