There's details on the ego 08? Where have they been hiding?
I do not agree that markers are getting too light, but too small is a problem. I do not like the feel of the mini, just because it feels cramped as hell. Don't get me wrong, I'd still shoot one if it was given to me, but it just wouldn't feel right.
Only way guns will get lighter is if they change the design of the markers themselves. There is not much more meat you could shave off an SL74, but if you came up with a completely new concept, or even an adjusted version of the existing concept, it will become possible.