It's one thing to know who to ask for weed.
It's another to be able to find any random stranger, walk to a gas station and get alcohol.
They're both "easy" in a sense, but there's a semantic difference about whether it's easy for YOU to get cannabis or if it's easy for ANYONE to get alcohol.
I suspect tptacek is right at least about trying it. The debate about a longer-term trend of overall use is almost pointless until we wait and see. Many, many people I know claim that they haven't tried it because: they don't know where to/how to, they don't trust that they wouldn't get something tainted, it's illegal.
Yes, there are some that repeat the "it makes you a loser", etc, and they're not going to try it either way, but I certainly think that it will be more accessible to people who would have never pursued it but may be curious. (edit, sorry, there are also plenty of people who simply don't want to do it or don't want to be mentally impaired, or are worried about provoking an underlying mental issue, etc, I don't mean to criticize them.