As far as I'm aware, most people consider Becky/Ronda to be their preferred match, but aren't exactly upset Charlotte's going to be in there, because of the points Yaz has expertly laid out through the thread. From WWE's perspective, it makes sense. Not to forget the fact that should it main event, it'd cement the legacies of both Charlotte and Becky as the first main female main eventers in the history of Mania (Ronda too, but she's Ronda bloody Rousey and already has the MMA legacy and mainstream appeal).
I think it's very telling that in this thread we've been largely talking about the female match, and that shows just how hot that aspect of WWE has become in the past 12 months especially. WWE do a lot of terrible things and are deeply misguided in many aspects, but the main event scenes of the women's division have been stellar for much of the last year.
Rollins/Lesnar is fine for me too as long as Rollins gets to slay the beast. They've done an admirable job of cementing him as the workhorse of RAW and the "best wrestler" on the brand via his IC title reigns and lengthy performances. Just... please have him beat Brock. A major issue in the absence of Roman Reigns is that because they invested so hard in Roman, they neglected everyone else and as such, we're in a situation whereby the gap between Brock and 99% of the rest of the roster as credible challengers is ludicrous. Rollins is currently in the 1% and should be the guy to take down Brock. The fact there's doubt should lead to a fun fight between the two... as long as the right guy wins.