Try to be an established member (senior, hero or legendary) before making this kind of post, you will be differently oriented at that time.
I don't think it's a good idea though, it kind of sounds like it invalidates the opinion of the other users below Senior Member like myself. But you are right that they should be familiar with the in and outs of this forum before saying anything.
Full members are established members too already, that does not mean they do not have their own opinion to suggest on this forum, the opinion can even be welcomed, also do not get me wrong, even newbies and any other ranks can suggest their own opinion, if what is suggested is genuine and welcomed, I will not make such comment, but it is not welcomed as established members will see it, and this is common to newbies and junior members and normal member rank to make certain suggestions that won't be welcomed here. So, telling them in such thread to be a somewhat an established member will help them to know more and in which they will have different opinion at the time.