However, in 5 years I've yet to find ONE person that says, yes Nemo, you're right, Wikisource should be 10 or 50 times as big as Wikipedia, let's plan for that. Probably I'm wrong. :)

+1. Count me in !
It will be hard and I'm afraid we might lose some good users in the process if we don't do things the right way but the wikisources should and need to be bigger (and easier to use/edit, and more compatible-compliant, and so on).

The very question is : how could and should we do it right ?
My 2 cents : maybe we could do an other survey but more technical, writing down some proposals, drawing some mock-up and ask the wikisorcerers.

Cdlt, ~nicolas