Everyone has been patiently awaiting the ranked system that was released yesterday (April 30th) in NA, but it seems that the beta ranked system still needs a little work.
For certain, the system will be ironed out very soon. That is the entire reason for beta in the first place right? The issue may be resolved a few ways, you either allow people to play ranked in all scenarios of skill disparity, OR possibly implement a grouped ranked category that allows all rank disparity. I’m sure there are many options.
Riot is on it, and they will come up with the right solution.