So I wrote this mail to Support:
"I have a HUGE problem. I'm the guildmaster of a successful and growing DC oriented guild that I created 2 years ago and have only recently started to focus my attentions of building. Half of the objectives of the guild include being able to claim resources for the 'Hollow City Herb Co' in cyrodiil so members can quickly shop for supplies and continue the battle. I had NO IDEA that there was such a thing as faction specificity and only upon trying to take a resource did I find out that for some reason and chosen not by myself that the guild is locked to EP!!! Can you please please please please please change my guilds faction to DC?? PLEASE!! haha. It makes a huge difference in being able to continue with this guild that so far I have put a LOT of effort and gold into creating so that other players can make some gold and have some fun.
and got this response:
Thank you for taking the time to contact The Elder Scrolls Online support team. My name is Austin. It would be my pleasure to help guide you today, my friend. I definitely understand not wanting to lose your guilds progress when you have made the switch to a different faction since the guild was created. I sincerely wish I could provide more help for this, but currently we do not have any ability to change the faction of a guild.
Just wondering who would like it made possible to change the Faction of a guild?
Edited by Logicbomb00 on June 26, 2016 1:44AM
Guild Faction LOCKED 27 votes
I'd like the change to be made possible by request