Personally I like to watch the graphical replay since it is very illustrative of the expansion of the player. This info is not available from the event log (city locations and cultural boundaries), is it? However, of course it's better to reduce the hassle for other players than keeping this fancy feature, although I will miss it. What about making it non-mandatory for submission, but mandatory for award/medal competition(perhaps not workable though...)
It should be possible to reproduce the graphical replay from data in the save. I had already considered this, and I'll give it a go, but it will take a little effort. It will not be done until after we get the BtS systems in place and rolling. Are there any additional features you would like to see in the graphical replay, over and above what is provided by the current Replay file?