Not needed. I think it would cause more trouble, like which name do you keep (or do you rename it), what happens with the guild ranks and guild topics, etc.
The easiest way is simply to sell one of them to another user and have the members to join the other guild you want to "merge"
Also, you should add a poll to your suggestion (see how here:
http://forums.d2jsp.org/topic.php?t=57896631&f=258 )
This post was edited by Julien on Sep 17 2014 01:49pm