I'm finding this "Lesnar beat the Streak to give the rub to Roman Reigns" to be ridiculous fan fiction at this point. While I will agree that there has been an obvious program to build Roman, who may eventually benefit from it, I do NOT believe that is the reason the Streak was ended. First off, neither Vince nor anyone in the WWE has ever stated this as being the case. When Vince himself has talked about it, he has never indicated any such thing. He, in fact, came right out and said that the reason Lesnar broke the streak was because he was the only person left who was a realistic choice to do so. Being someone who never cared for the Streak to begin with, I always expected Vince to eventually end it. It has never been in his nature to let something like that stay intact indefinitely. He just never had someone he considered to be the realistic opponent until Lesnar came back.
The entire premise is ridiculous too. Let's have Brock Lesnar beat the Undertaker's Streak so Roman Reigns can beat him and be a bigger star, because obviously that's the same thing as Roman beating Undertaker... except it's not. And in fact, WWE has made the point over and over the past 30 years that anyone can beat anyone on any given night. It they wanted to give Roman a boost by beating the man who beat the Undertaker, they would have had Roman be the guy who beat the Streak. They would not have set him up simply as the guy who beat the guy who beat the Streak.
And yeah, I hear the nonsense about how WWE wouldn't have had Roman beat the Undertaker's Streak because he would have been booed but I find that to be absolute drivel as well. If Roman went in as a face, had the fan support (since at the time the Streak was broken Roman actually DID have fan support), had him beat the Undertaker and had the Undertaker be gracious in defeat, it wouldn't have turned Roman into a heel.
IN FACT, this probably would have done more to help Roman than to hurt him. WWE could have had Lesnar lose to Undertaker and the following year had Roman face Undertaker. Keeping Roman out of the title match at Mania 31 would have likely satiated the Daniel Bryan fanbase who felt Roman was inserted at Bryan's detriment. People wouldn't have felt Roman was being forced down their throats as the de facto champion/face of the company while they were still hot on Bryan, there wouldn't have been as high a backlash and Roman would have been given the time to grow and possibly go on to the following Mania to win a world title with more fan support.
So, I have never seen any credible evidence that the streak ended to give the rub to Roman to be anything more than fan theory. And I don't count "insiders" whose names don't end with McMahon as being credible sources on this.
Now, if this was WWE's intention, it doesn't matter anymore. Lesnar just beat Reigns two matches in a row... and I Don't care about the nonsense about Roman's feet hitting the floor and Brock's didn't when the ref called the match one way, it was a defeat. So what now, after three attempts and three failures to beat Lesnar, Roman beats him a third time and that makes him a beast slayer? Nonsense.
Goldberg slayed the Beast. Whatever is going on now is scavenging the carcass.