FC websites exist for a reason. While having this function ingame would be nice, can you truly tell me that you would ask SE to budget their programers time to make such an ingame feature that is easily made available in your standard FC website hosting such as guildlaunch? Or have someone who knows some basic HTML/php in the FC code up a simple version for a website that can handle this? Making a simple database to handle a few groups of 8's schedules is not too hard, but for every FC and large scale implementation its a bit more work/time tht FFXIV needs in other places right now.

If we see something like this in game it will be a user made addon, but i'm not even sure if that will be possible as I don't know if the game will have the ability to store such information with addons. But this is an online game, so all have an ISP, and anyone who is so concerned with their time and scheduling shouldn't have an issue logging into a FC website to look at events and sign up.