I couldn't find any remarks from him in 2002 about Mozilla's chances, but in 2001 he said "I think not. In a world of free browsers, the flavour of the month can change like that." [1] in response to a mailing list message saying that Mozilla would not be viable competition on Windows due to bugs, which is somewhat less optimistic than the "pretty good" odds in hindsight, but it's much more so than "very long odds against us retaking any browser market share".
[0]: http://www-archive.mozilla.org/start/1.5/credits.html [1]: http://marc.info/?l=mozilla-ui&m=100168107415632&q=raw