Sorry, I'm voting No.
Before I joined Galaxy (my first guild) I had to deal with a couple of invite PM's each week with peeps getting upset when I politely declined. Adding this feature would make it even more likely to recieve an invite since it would be a one click thing. After declining the auto invite, it would be likely to be followed with a Why Not? PM.
I only left Galaxy when I bought my own guild. As the owner I only invite peeps I already know and game with and the discussion would happen in game or in PM's that we are already using so no need for this feature.
Yes, I've read the suggestion to let a member disable it. However, not implementing this already accomplishes that.