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After adding the pages the site suffered a huge drop in traffic.
I would say that this is either
a) a result of Google being cautious of so many pages added at once or
b) the result of the dilution of PR throughout the site as there are now 50000 extra pages.
I am now wondering if I should put 'no index / no follow' on these pages or just wait and see if it is a temporary drop. Any thoughts?
'Noindexing' a portion of the pages or 'Nofollowing' some upper level pages to keep the number of new pages added to the SE index might be helpful, but I have not dealt with the 'over addition' of pages specifically myself, so if there is already a problem I do not know what the exact solution is. It may be an e-mail or re-inclusion request from a webmaster tools account is necessary.