I didn't come here to play poker with you.
I came here to voice an opinion: that if ENWorld doesn't take action, it will probably become unbearable to use without a DDI subscription. That's not a game or something to be taken flippantly.
This filter would be relatively simple to implement. As a bonus, it would considerably reduce the power of WotC's marketing scheme for 4E (I'm not the only one who avoids Wizards' own site).
The bottom line is that DDI will make up a large part of the news items from the by-far biggest manufacturer in the business that ENWorld is in. By reproducing news that more-or-less consist of nothing but a link that slaps up a "subscribe now" dialog in your face, ENWorld will actively promote DDI regardless of what you say.
And become considerably less useful in the process. This would be a shame, considering how easy it would be to implement a solution.
Not taking a stand is taking a stand too, you know.
Edit: Let's discuss Google News. When that free service started out, a considerable number of links led to subscription-only news sites. This was clearly very unpopular. After some time they (Google) added a small note to each such link, saying it required a subscription. Eventually, however, consumer choice culled away most subscription sites naturally - it still happens once in a while, but it's now sufficiently rare I can use the site not thinking about it.
In the case of ENWorld, there aren't several hundred more-or-less identical sources to link to. Only one. So ENWorld needs to be much more proactive than Google had to be.
A filter saying "don't show items with links to subscription sites" would be great. Much better and much simpler than some message that you'd easily miss anyway.