There is no such consensus. The RfA system works for you because you use it, as do all the others who participate. There are far more people who just wash their hands of it., and just limit their activities to some narrow topic.
On Wikipedia "consensus" is used to mean "consensus of people that decided to express an opinion". We don't hold referendums on policy decisions. Every time a proposal for a new system of selecting admins has been discussed, it has been rejected. That is a consensus to keep things pretty much as they are. It's possible that some new proposal might gain approval, but none have so far.