/signed
I recently had to travel for 8 consecutive weeks for work and even on weekends didn't have time to play due to family commitments. I would have hated to have been booted from my guild for that. I do hate that my time away hurt my guildies, though.
I think a fair solution would be to eliminate guild decay for VIP accounts, reduce the decay for Premium accounts, and keep decay the same for F2P accounts. This way you are encouraging people to support the game for the benefits of joining a guild.