According to the WON, there's a strong push backstage in WWE for this match to ultimately be in the main event slot of the show this Sunday but Vince doesn't feel that it should. The report doesn't state why Vince is opposed to it or anything, so my own opinion is that Vince simply doesn't feel that the women are strong enough to genuinely be in THE main event slot at a ppv. Triple H is said to be in favor of Sasha & Charlotte closing the show as he not only has faith in them, but feels that it puts more emphasis on the fact that this match goes down in Sasha's hometown of Boston and on the history that this match will make as it's the very first of its kind for women in WWE.
As I said in the thread regarding a woman winning the Royal Rumble, I'm really pleased with the progress women in WWE have made over the last 15 months so, for me, whether they actually main event this Sunday or not isn't a deal breaker that I'll be bitching about afterward. With that being said, I do think it's the right move to make in this case because of the circumstances surrounding the match. For one thing, it's Sasha Banks' hometown and there's a very strong probability of her getting the biggest pop of the night. For another, you have to consider the possibility that the gals are going to go all out in this match because it's historic and there's always the chance that whatever match would close the show, which would be Owens vs. Rollins almost certainly, simply won't be as good. There's also what I think is a very strong possibility of Triple H interfering so that Rollins loses; I'm sure I'm not the only one who has this feeling though it would be a nice surprise to see the match end clean.
Another thing to consider is that this match is almost certainly the blow off to the Sasha vs. Charlotte program, it's the first female Cell match so having Sasha lose only to have yet one more match to close it is not only reductant but undermines the historic potential of this match itself. As a result, closing the show with Sasha emerging victorious after a helluva physical bout with Charlotte to retain the Raw Women's Championship inside the Cell and basking in the babyface adulation of her hometown crowd strikes me as simply the most logical way to end the show.