There is an assumption from the front office (and many others), that because they were able to smooth this process out for the Seahawks, they will be able to do the same for the Sounders. It is my belief that this assumption is fundamentally flawed. I do not believe that the Sounders' game entrance will ever run as "smoothly" as the Seahawks' games, even with only 2/3 the number of fans.
The NFL season is itself a relatively short lived thing. Lasting for 4 months, it is the shortest season in American professional sports and is treated differently than any other. With only 8 home games, NFL games themselves are events. Events that people plan their day around. There are no midweek games, Monday night football is treated almost as a holiday for the home team fans. Those in attendance most commonly take the day off of work.
The MLS season is different. Lasting from February to December, it is the longest season in American professional sports. Counting all competitions, The Sounders are likely to play almost 3 times as many home games than the Seahawks in a given season. Attending a Sounders game is, without doubt, the most noteworth event that a fan will attend during the day, but, for most fans, it is not their only plan for the day. This is unfeasible for most people to dedicate a full day to the Sounders every time that they play at home.
These mindset differences are essential to consider when thinking about how this process will perform moving forward. The front office can make refinements to the process, adding additional workers or somehow expanding checkpoints. However, the real streamlining of the process will only be seen if the fans themselves adjust to the process, as has happened in the NFL.
These fan adjustments require that a significant number of attendees will plan on coming earlier. It's obvious that some fans will make this adjustment. I think that we can fully expect people to show up early to avoid what they ran into today. The question is if it will be enough.
Can the front office truly expect Sounder fans to begin treating games as all-day events, as the Seahawk fans do? I firmly believe that the answer is "no". No matter how much we love our club, no one can afford the extra time for 20+ holidays a year.