Some of this is a policing issue. As you know, we have a very widespread, profound and persistent problem of police unfounding of sexual assault in Canada. The rates in some jurisdictions remain very high. Prosecutorial guidelines won't change that for those provinces that use police as their charging decision-makers.
Yes, prosecutorial guidelines can be helpful. I imagine most provinces actually have prosecutorial guidelines on sexual assault, and I'm sure that some provinces will be issuing ones that include extreme intoxication as part of their effort to guide Crown prosecutors in making their decisions in these cases.