Some childminders and nurseries are outstanding, some are OKish and a minority are utterly crap. If a nursery or a childminder is merely satisifactory then there is no way they are going to be able to cope with a higher ratio.
I feel that nurseries and childminders should have to prove themselves first before being able allowed to increase ratios. Its one thing to have fancy qualifications, but another to actually do the job. If a nursery or a childminder lose their outstanding rating then they should be forced to employ extra staff.