#1. Fastlane needs a solid main event

To absolutely no one's surprise, Brock Lesnar will not be defending the Universal Championship at Fastlane. In fact, it's not even certain that Ronda Rousey will defend her RAW Women's Championship at Fastlane, because, from the way WWE is making it look, Rousey has already secured her spot at WrestleMania.
With no RAW Women's title match or even Universal title match, the no-brainer option to main event the show would be the WWE title match. Kingston and Bryan showed in the Chamber that they have great chemistry together.
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They can main event Fastlane because they will be the best match on the card, bar none. If they do get the main event, then they'll also likely get a good amount of time to build and have a great match.
It's time to be excited about Fastlane because Kingston vs Bryan is going to be guaranteed fireworks!