Nothing shown so far from anyone warranted the need for a conference. These companies are doing nothing but wasting hours of our time when they could simply post trailers on YT. Most of the games shown at E3 this year don't even have actual gameplay. There have been no real megatons or surprises to be had.
Sony's got the winning formula down pat. When you've got a banger to show give it its own special showcase to let it shine and to value your viewers time.