If they made it worthwhile to spend and extra 30-45 minutes in and around the ground post-game it would massively improve congestion.
Maybe have discounted beer or merchandise post match etc...
This is actually a really good point. I guess it's tough because not so many spurs fans actually live in close proximity to the ground. Plus once the football crowds have gone home it's not exactly the most safe place to hang about.
Compare that to Highbury/upper street and the Kings Road/Fulham Broadway. The one thing I'm jealous of about those clubs is that you can actually continue you afternoon/night pretty close to the grounds. Hopefully the regen will help with this.