Perhaps there's a compromise solution.
How about forming groups among the 100,000 pages and then, while letting them retain their existing individual URLs, create what could be seen as Topic pages that each assemble the relevant group pages as a list with a link to each individual one?
It isn't a perfect example (if only because my numbers are considerably less than yours), but here's what I do regarding the webpage versions of two dozen monthly newletters that I've sent out.
1. My home page mentions (and gives a link) to mydomain/mailings.html . This page lists mydomain/buyers.html : my domain/lawyers.html : mydomain/interests.html : etc., etc. As a visitor clicks on any one of the ...html links, it takes them to the relevant ...html page.
2. This allows me to avoid the cumbersomeness of mydomain/subdomain/subdomain. It also (or so I like to think) increases my chances of searchers finding me because of phrases (i.e. keywords) that each specific .html (i.e. newsletter text) page contains -- which I don't think is going to be as likely if the search engines have to go to a third level instead of a second level depth.
3. For good measure (or so I again like to think), it enables me to cross link all the individual newsletter pages to both the mailing.html and mydomain pages.
In a way, I suppose I'm thinking of a text book analogy. There's the book title itself that's broken down into chapter headings that then each have subheadings in them.
Duncan
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