I think not having a press conference is a really bad idea. Big news sites all report on E3 conferences with a concise summary of all announcements, even local sites do. I don't think the info given at those Tree House thing or even Nintendo's stream trickled down on such a level that even my local newspaper reported it, but they did Sony's conference where real journalists attend the show.
Tree House is a good idea but their press conference should be held alongside it. They will complement each other. We all know the reason they haven't done a conference lately, it's because they lacked content to show. Those E3 streams were 40 minutes long which would be a hell of a lot shorter in a press conference format cutting all the long demonstrations and pauses.
