Well, there's more discussion now, period (thanks, Twins Daily!). But I don't think it breaks down the way you suggest. Obviously, before the 1970s, there wasn't a whole lot to discuss in transactional terms, thanks to the reserve clause. But by the same token, there was so little detailed data on player performances that I don't think there was really any greater discussion going on about that either -- how much can you really analyze/discuss a basic box score or season/career stat line? First with the advent of Retrosheet, and now with video and PitchF/X, there is more discussion about player splits, swings, pitches, etc. than ever before. (Thanks, Parker!) And I would suspect that managerial decisions and roster management have been at the forefront of baseball discussion since time immemorial.