I would say no to this. If we're going to change the system, let's make it so that we don't give sassmang or whoever the last placed user is any power.
If we're going to change it, I'd say 3 or 4 moderators have to vote for a user to become an expert. Three might be better for the current activity of moderators but four would make sure only the most qualified are in. After all, I would think it very difficult to get DT's vote (based off him saying multiple times that if everybody has power, nobody has power) or my vote (because I think we have enough moderators and would say no on every user besides Rio, who is awesome).
Of course, Pokemaster could also make people Experts. :P
As to whether our current experts would remain experts, that I would like to know what Pokemaster would think if he adopts this system.