Go ahead and lobby for them, people who are opposed to the guild halls or think they are a waste of time (like myself), don’t care if you lobby for them at all.
However, you are comparing two entirely different type of things.
Your suggestion, guild halls, is something that would actually have to be designed / programmed / implemented / tested. All of that actually takes away from content and development of features that matter.
Adding in a store mount is a skin, that’s it. Its something the graphic artists do when they don’t have other projects.
As for your argument that a guild hall is fun, that is your opinion. You’re entitled to it. However, I think it would further detract from the persistent world and the human interaction that so many people have already complained about.
Why further isolate yourself in a MMO?