HD / HDTV / HDV / D Cinema / D Day ?
For many it's habit.
Old timer: "Why should we change medium when all my best work I've done on film. I filmed Dday with the same camera I use today and I'll carry on using it till I snuff it."
For Others It's prestige.
Large budget bafoon: "We filmed our corporate video on 35 mil, Stanley Kubrick would have been proud of our MiseEnScene! The lenses alone cost a zillion a day and, you know what, It was worth Every Penny."
The pessimist: "How do we know which HD format survives? 1920p, 1280p or 1080i?"
The first two might never migrate to HD might never happen. There are many who are so secure with celluloid that they will not take risk with the newer fomats. Those who have a high enough budget, or whose format choice forms a small part of the production cost, might be right to prefer film. The pessimist should warm his feet. The formats will co-exist, for a while at least. They're not a delivery system so we don't need to worry about which survives. I reckon they all will as different levels of HD.
For me it's a question of value. Sure on the lower end of the market its well worth using a low end HDV instead of a mini DV, but why should use HD instead of Digibeta? Price wise it makes a big difference. It's not just about the cost of production but also Post production.
Not every facility has upgraded its cards, hard discs and software to deal with HD. Most of these are waiting for prices to come down further, or demand to increase to justify their costs, or praying for a magic codec that will allow them to use their current machines to do the job.
With HD we should stop asking whether the chicken or the egg should come first and instead JUST START COOKING! Cooking ? How exactly is HD eaten?
Delivery will it be Blue Ray or HD DVD? When will HDTV become standard? when will we stop down sizing the master to SD because of a lack of HD delivery mediums? By the time those questions are answered, Everyone will be on HD.