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You can wait, the decission is from google, but i agree with the last response. Make google knows they doesn't want to cache / see this page with robots or another method, and then, wait. There's no more options for somethink like that.

Are you absolutely sure there isn't something else going on?  Usually Google is pretty good at picking up this type of thing and just discounting the links.  Plus, if the links were generated to pages that didn't exist then they wouldn't be passing any signals (i.e. penalty) to the site.  In fact, removing pages is a way to remove links.  (See http://searchenginewatch.com/article/2296653/Removing-Unnatural-Links-by-Removing-Pages-on-Your-Website) You mentioned it happened about 6 weeks ago...I'm not sure if it fits, but 4 weeks ago there was a very large Panda update that upset a lot of site's rankings.  Any chance the drop happened around May 20? Have you checked WMT and sucuri.net for signs of malware?  Often when pages get injected like that it comes along with malware. I'd also look for things like accidental noindexing or blocking pages with robots.txt.  I had three sites this week consult with me because they thought they had penalties and two had lost their analytics code and the other had accidentally noindexed the majority of their site. If the ranking drop is indeed due to the bad links then you really should recover now that they've all been disavowed.  But I'm guessing there's something else going on.

For detailed SERP reports on Google (including geo-specific reports) you should try www.georanker.com. As a registered user the tool allows you to crawl 100 keywords in each report.