This is going to make for some fun on social media during E3. Fans who bought access will complain that the games they want to play either aren't accessible or have all-day lines. Press will complain about too much traffic to wade through. Good times, assuredly.
I don't blame fans for being excited about this opportunity. Many have read about E3 for years and now have the chance to go. It's dream stuff-- but the reality of it is far different, once you get there. Without appointments and/or industry contacts, fans aren't getting close to most of the prominent games. Access to the Nintendo stuff will almost assuredly be near-impossible, and that will be one of the show's most populated areas. It's possible that a few exhibitors-- maybe indie devs or accessories makers-- will be less crowded, but these will be exceptions and not the rule.
I feel for press, too. As it is, getting from one appointment to the next is a challenge with the throngs of attendees already in place. Add another 10K, and... yeah. People had better bulk up, because there will be some pushing and shoving to get by. For smaller press outlets who are unable to land appointments, it's going to be the ultimate nightmare.
Worst of all, I feel for exhibitors. Having to change strategy and cater to fans-- as well as the demands of press and of retail purchasers-- that extra stress is gonna be tough to handle. There will be a lot of complaining from fans that don't get access to games on the show floor, or angry that the games they want to see are behind closed doors. It's going to take a lot of patience to deal with this new element.
I'm fortunate and feel honored that I got to attend E3. Each year was amazing and I learned a lot about the business and about how to manage my time in an event like that. I met amazing people, forged friendships, and got to see (and cover) some really cool stuff. I get wanting to go... but, unless you're a professional, you've got to keep your expectations in check. Fans are not going to get the same experiences that they've read about online or in magazines over the years.