#4 Other matches would get more time
For the past four years, SummerSlam has had ten matches on the main card. This means that some matches would have to be compromised in length to offer more time to others. Due to that, we saw three different squash matches at last year's show. Expect at least one such match at this year's show. WWE should strongly consider making that match the one between Bray Wyatt and Finn Balor.
Aside from the fact that it would produce a monumental shock on the show, Wyatt squashing Balor would allow other matches a few extra minutes that could make them classics. Matches like Bayley vs Ember Moon and Shinsuke Nakamura vs Ali, among other possible matches, would certainly benefit from a little extra time. After all, we do need the perfect balance of good wrestling and shocking moments on any show.