The longer they wait, the worse it will get for their PR and Marketing. There will also be a much bigger risk of something getting leaked out. They are starting to tread on a minefield here, things are already leaking. Here is a list
*Demon'S Souls for end of the show
*Bloodborne for PC/PS5 for end of the show
*Call of Duty 2020 Pre-alpha footage leaked already.
*Resident Evil 8 to make appearnce at the show. Set in castles, villages, forests and caves. Themed with occult horror, spirits and werewolves. Think Resident Evil 4 combined with Resident Evil 7. Female protagonist, male antagonist . Chris Redfield involved. January 26th, 2021 release date, cross gen.
*Horizon Zero Dawn 2 hinted at by Guerilla Games and prior leaks
*Silent Hill Reboot, this needs no explanation. Tons of leaks
*Dead Island 2 prototype footage leaked from 2015 PC Build. Possibly being reintroduced as a cross gen game, could be at the show.
That's a lot of leaks already. If all of these are true, then I'd say half of the show already leaked.