If people are concerned about this sort of thing meaning an end to free content, then the best thing I can suggest is to do what I did:
If you get a chance to complete the survey, there's a section where they ask you what you least like about the proposed program. Use that opportunity to state that you don't want the D&D Insider program to mean the end of free content on the website, especially features that are currently offered for free, or for content to take too long in moving from "D&D Insider" to "free for all comers" status.
I figure a month, maybe two, is the longest that I would be happy seeing Wizards of the Coast keep this sort of content exclusive to the D&D Insider program. After that length of time, it should be accessible to anyone. It's enough of a wait to make those who can afford to pay for it willing to do so, but not too long that the less-wealthy feel like they're missing out forever.
I say this as someone who's quite willing to join the D&D Insider program if it gets off the ground. Several Wizards of the Coast staffers have commented in the past on the fact that their current web content is limited because it's expensive for them to do; if this proposed program could subsidise an increase in the quality and quantity of the content offered on the website, I'd be delighted.
That goes double if it means, for instance, that Keith Baker can be hired to do more Eberron web-articles on small topics that won't warrant their own sourcebooks for a long time, if ever. For instance, Planes of Eberron may or may not sell (they haven't done a Planes of Faerun, for instance), but wouldn't a series of Dragonshards covering each plane in turn be pretty popular in this program?