There has been no admin activity for over two years, so they are not likely to come back. Even if they do, I'm sure we can work out an agreement. The admin role just allows you to easily rollback vandalism, block spammers, and modify the look of the wiki if you so choose. You won't be alone, I am here to help and answer questions. If there are features on other wikis that you think would be useful on Agarest, let me know and I'll be happy to help you implement them.
You can reply here or on my Agarest Talk page with your decision :)