Its a fair question - just ignore Jonny hes probably just bitter because of his crappy results
Its logical to assume that there will be less people able to apply because there will be less actually making the grades.
However, it may be the case (and I think it probably is) that many candidates already had AAAb when applying to such a competative med school so perhaps the difference wont be so significant.
Also, don't underestimate the lure of an 'elite med school' that only accepts 'the best'. Much like Oxbridge, I reckon it will recieve huge amounts of applicants because of this.