I too thought the civ1-style tech popups were great. I read all of them I think.
The problem with civ1 was the slow "Wise men have discovered" bit that took several seconds to load. After your first play through, even before the end of your first playthrough, that became annoying.
The simple solution is to have nice detailed tech popups which can be disabled by people who no longer want to see them.
I found the tiny scrollable text box implementaiton of tech descriptions in Civ4 very unsatisfying. If I want to read the civilopedia, I shouldn't have to read it in a tiny text box that needs to be constantly scrolled because it shows only 3 or 4 lines (I can't remember the exact number).