PBEM-like mode

I love play 4X games with my friends (both video games and board games), but we are adults now and many of us have their own lives and a lot of duties. We try to arrange ourselves to play together, but we never can find a time that's cool for everyone (there are 7 of us).

I believe that I'm not the only one with this situation. I have an idea how to solve it, but I'm sure if it's easy and cheap enough for you to implement this. I hope it is ;)

What about mode, that's save is stored on the server, not host and everybody had 8/12/24 hours to do their turn? Players could load the save, do their turn and with "end turn" button the save would be updated and be ready for another player. Nobody has to arrange much time in their busy day, but I know one game would last even a month or longer. That's not so bad, it would help us arrange the game more, dissqus them between turns, focus better on details etc, so such like 4X is in its pure best form.

What about diplomacy? I see no problem with even one turn delay with their effect, but messages about diplomatic events would be posted in your mode wall even if you end your turn. And what about combat? Well, the only way I see here for now is just letting our fleets set their standard tactic that will be our reaction of attack.

What do you think about it? Don't you think it would allow players arrange into more deep gameplay just next to regular games?