My worry would be that the complainant has told the Crown, “He seemed really drunk” or “He seemed out of it” or “He seemed high”, so that the Crown will have some indication that this is an issue, and that may impact charging decisions.
I'm less worried about the cases that make it to trial. I worry for the reasons I set out about the standard being unprovable. A woman may be put through a trial with no chance that the perpetrator is going to be convicted. In terms of the impact on sexual assault more widely, I'm worried that the charge won't even be laid to begin with.