I vote that the top rankings should not just go to the players that are on 24/7. The following is a proposal for a way to allow players with less than 24/7 availability to fairly compete with others with similar availability.
PROBLEM:
When the game releases and campaigns last for several weeks, the tops of the leaderboards (which determine who becomes emperor when the conditions are satisfied) will be filled with players whose accounts are played around the clock. Usually, these accounts will actually be several players playing in shifts to accumulate as many Alliance Points as possible.
As a result, the leaderboards won't have much meaning to everyone else who plays honestly, since they'll have no shot at becoming emperor. Most people want to have healthy participation in PvP, and it's detrimental to disenfranchise all the players who can't play around the clock.
SOLUTION:
Let players opt into a campaign where each player in that campaign can play up to X hours per week in Cyrodil. For some campaigns X could be 20-hrs per week; for others campaigns, 40-hrs per week; others, 60-hrs per week, etc. For everyone else, they can go about their merry way in unlimited time campaigns.
The idea is that players would select a campaign whose hours are capped at an amount of time similar to what the player would have spent in Cyrodil without the cap. That way he/she is only playing against other players who will be in Cyrodil for a similar amount of time. Cyrodil would still be a persistent world 24/7, mind you, but each individual player who chose that campaign could only be in that world for up to X hours in a given week.
So everyone who plans on playing the game 30-40 hours per week, for example, can join a campaign that limits players' time to 40 hours per week in Cyrodil. That way, the characters played by three or four guys sharing an account in shifts around the clock have no advantage in such a campaign. This choice to join a time-limited campaign is completely voluntary, so if that's not your cup of tea, or if your guild wants to do something else, you're free to join an unlimited campaign.