The problem with ``youse'' is that it never seems to be used on its own. It always seems to modify ``guys'' or ``goils'', and, therefore, is an adjective, not a pronoun. You could make arguments that it is a pronoun because ``guys'' is being used to redefine ``youse'', but I don't buy it since it never seems to be used alone.

Regardless, if anyone would like to continue this dialogue, to which I would not necessarily be averse, let's start it back up in Off Topic.