Netflix just needs to convince the movie studios to release more studios for streaming. One way is to show that they won't have any other viable way to reach home viewers. (Presumably, it thinks little of Redbox's chances.)
As a Netflix streaming subscriber, I don't object to Netflix trying to push the studios into better supporting online distribution. But it's still awkward to see it do so by essentially treating customers as hostages. Netflix's clumsy explanation doesn't help its cause. Nor does the existence of web rivals like Hulu Plus and Walmart's Vudu–or the impending arrival of a revived Blockbuster streaming service, relaunched by its new owners Dish Network.
(Update, 9/23: Never mind about the Blockbuster option announced today; Dish has foolishly chosen to limit that service to people who already subscribe to its satellite-TV service.)
If you're that annoyed by Netflix's treatment, complain all you want–but you'd communicate your displeasure more effectively by signing up with one of those competitors.