For the past five years, my greatest fear at Netflix (NSDQ: NFLX) has been that we wouldn’t make the leap from success in DVDs to success in streaming. Most companies that are great at something – like AOL (NYSE: AOL) dialup or Borders bookstores – do not become great at new things people want (streaming for us) because they are afraid to hurt their initial business. Eventually these companies realize their error of not focusing enough on the new thing, and then the company fights desperately and hopelessly to recover. Companies rarely die from moving too fast, and they frequently die from moving too slowly.

When Netflix is evolving rapidly, however, I need to be extra-communicative. This is the key thing I got wrong.

In hindsight, I slid into arrogance based upon past success. We have done very well for a long time by steadily improving our service, without doing much CEO communication. Inside Netflix I say, “Actions speak louder than words,” and we should just keep improving our service.

But now I see that given the huge changes we have been recently making, I should have personally given a full justification to our members of why we are separating DVD and streaming, and charging for both. It wouldn’t have changed the price increase, but it would have been the right thing to do.

So here is what we are doing and why:

Many members love our DVD service, as I do, because nearly every movie ever made is published on DVD, plus lots of TV series. We want to advertise the breadth of our incredible DVD offering so that as many people as possible know it still exists, and it is a great option for those who want the huge and comprehensive selection on DVD. DVD by mail may not last forever, but we want it to last as long as possible.

I also love our streaming service because it is integrated into my TV, and I can watch anytime I want. The benefits of our streaming service are really quite different from the benefits of DVD by mail. We feel we need to focus on rapid improvement as streaming technology and the market evolve, without having to maintain compatibility with our DVD by mail service.