Honestly, I don't see this is such a big deal. Almost certainly the PDFs will be available again in the future, once WotC takes some steps to stop pirating. Older supplements and books will probably also be offered again, so most likely this is a temporary suspension of PDF availability while WotC decides what to do.
Now WotC DID handle this badly, at least from our limited perspective right now, with a decision that reeks of a small-minded MBA. I can almost guarantee Scott Rouse, Mike Mearls, and the rest of the D&D folks had nothing to do with this, and probably aren't terribly happy about it, but they have to do what management says. Removing the PDFs will probably not noticably reduce piracy. However, if they are working on some sort of registration key for PDFs that has to be activated under a specific username, and they can track where those PDFs pop up online for pirated distribution so they can prosecute the pirates, then I'm 100% behind this decision.
As I never use PDFs, this doesn't affect me in the slightest- I much prefer the feel of a book in my hands. However, I can understand the anger of some PDF publishers that also rely on sales of WotC PDFs to move their own PDFs, and they have my sympathies. However, for everybody else worked into a frothing frenzy about this, I really have a hard time understanding the vile hatred and conspiracy theories being spewed. From what I've seen here over the last two days, the people saying this are the same folks who always take potshots at WotC, the same ones who seem to feel betrayed by WotC for the development and production of 4e, and the ending of the 3e line. This isn't a 4e or 3e thing, this is about WotC protecting their intellectual property and livlihood, and if WotC can figure out a way to stick it to the pirates, then good for them!