I see many people complaining about people dying to port across the map to a forward camp. Those people will have a fit if this ability taken way. TBH I do that all the time in Cyrodiil...
How about making it so you can only resurrect at a forward camp if you are in range of its white circle (suggested already) AND travelling on the roads give you a large travel speed buff? This way players can use transit shrines to get close then use a road to get closer, this would lead to a more dynamic battlefield like two armies meeting on the road, making it difficult to sneak a forward camp far into your enemies backfield and ninja siege a castle. Also defending a keep across the map would be easier than just taking away the FC. With a fast road... people might actually use them.
Character: Jannex NB Stealth Hunter