Try changing the way you play. As an old fool, my games are people around a table, with figures and scenics. Rather than suspend a campaign, or let it die of disinterest, get up from the table and only play by conversation in the pub(Referee has the right to correct anything said whilst blazing drunk). Try resting the campaign, with players writing to you, then moderate their actions. Sometimes a players personal desires can trigger a plot line. Other ideas may fit more with your life, but the idea is the same, try a change, then get back to it.