I am going to break this down in my typical business analytical way.
Lets say the breakdown of HD channels is this.
50 accessible to you nationally and fulltime 24 hours/7 days a week.
20 are regional sports and you only get one.
15 are Sunday Ticket or some other Sports subscription
15 are something else, fluff or PPV
So the impact to me is potentially this much HD a week.
True National: 50 x 24 x 7 = 8,400 hours x 50% watchable or not dupes or just plain crap = 4,200 hours
Regional Sports: Lets just be fair and say 5 games a week or 20 hours at 4 hours per game
Sunday Ticket: 13 games x 3 hours = 39 hours
Other: 15 x 24 x 7 = 2,520 x 10% applicable(?) = 252 hours
So this launch gives me the option to watch 4,511 hours of HD. Lets say I watch 4 hours per day or 28 hours per week. Lets say 14 are already served in HD today (Sunday Ticket, HBO, Local Networks, ESPN, NESN, HDNet, etc.). So I could adjust my watching for the 14 hours unserved or would supplement with newer available HD. Thats potentially 4,511 hours to fill 14 hours or 322 hours of choice to fill 1 hour.
I like my odds that whatever the number, I only have to find choice to adjust or fill 14 hours per week. So the number could be off by 20 fulltime, but I am pretty happy with my odds that the new channels they are announcing is going to have enough content to make my unfulfilled 14 hours per week satisfying. Whether its 322 hours to 1 hour or just 100 to 1, its a great time to be an HD Directv subscriber.