Everyone from Member to Community Manager (even Chapter Officer) status are allowed a maximum of four characters, with Apprentices allowed just one. Full members are treated equally within the game and on the forums - the only difference is that some of us simply have more responsibility than others.
That sense of equality would be diminished if some members were forced to reduce the number of characters within the guild - because of any perceived inactivity (on their part) - all so that others may increase their character beyond the four allowed. Something like that could possibly engender discontent and resentment. I say the maximum character number of four should be maintained - and only adjusted further down if we get too close to the cap.
The character cap for the guild is at 500 - we have 365 currently in the guild. Inactive members are gkicked periodically. Before we talk about changing character limits for the guild, we should first see how things go with the update/added content. Worst case scenario is that characters can be shuffled in and out (I don't envy the swtor officers ).