They've actually been turning out web material at a decent rate:
http://www.wizards.com/default.asp?x=starwars/article/sw20050428kotor Two new prestige classes inspired by KOTOR (Jedi Watchman and Dark Side Assassin), and the entire Dark Forces Saga series of web articles with characters from the Dark Forces/Jedi Knight series written up, and the Byss and the Deep Core series of articles.
My suspicion is that internally WotC wants to make SWRPG materials (they're certainly spending money to have people write web articles, and presumably have them cleared by Lucas Licensing), but some licensing/financial reason is preventing them. Either they think the books won't be profitable enough, or there is too much hassle with Lucas Licensing, or one arm of WotC is fighting another about the future of the line. As long as they haven't cancelled it, I still think there is hope. Even if for some odd reason WotC cancels the line and maybe some other company picks it up, that doesn't mean you can't play d20SW anymore, plenty of people still play d6 even. Setting and system are independent.
The pragmatic part of me just sees d20 SWRPG as a RPG I can "complete" and have everything published for. I do really wish they would announce a Clone Wars sourcebook especially, as the only thing I don't at least have an existing book of (d20 or d6), I can convert source material from d6.
DnDChick, if you can find any of them for sale used at a FLGS or on eBay at any reasonable price, I recommend you pick up just about any of the sourcebooks West End Games made for their Star Wars RPG between 1988 and 1998. Conversion rules from d6 to d20 are published in the Original Core Rules or online at the WotC site (
http://www.wizards.com/starwars/article.asp?rpg_conversion,2,rpg), and it has a lot of good source material.