I don't speak for Wayne obviously, so this is just my opinion. Wayne's opinion may vary by a wide margin.
My 2 cents worth: This site is dedicated to and about Amiga, it should always be usable by real Amigas, even if our numbers have fallen somewhat. Those with "modern" computers and OSes can go anywhere on the net without hindrance. It's telling that the other 90% of user's choose to come here, says a lot about the quality of this site and the community here.
I appreciate what you are saying in theory, but in practice it is extremely impractical. Think about it, it is now 2008 and historical Amiga browsers are built on mid 90's technology. I am a huge retro fan, I use my Commodore 128 all the time. However, it would be silly to expect C= forums like Commodore128.org and Lemon64 to make their sites friendly to C64/128 native web browsers. Web technology moves on while our ancient orphaned platforms do not.