They should just drop the brand-exclusive PPVs honestly. They've really been nothing but headaches since they started them back up with how completely dull and repetitive Raw's side is and how thin SmackDown's is, they haven't really done anything to help the Network, and most of their ticket sales have been not good.
I mean, I'd rather just watch SmackDown only shows, but from a business perspective there really isn't any reason to keep doing them.
At the very least, do alternating PPVs every month like during the first brand split. There is no need for two Raw or SD PPVs in the same month.
That's my preferred format. Shows like this week's Smackdown can fill the gap when a brand has a long time between PPVs.
Would rather it be a cross-brand match at WM instead.
SD's roster is already thin so if they have to put 6 guys in one match with high risk of injury, not only will the rest of the card suffer but so will the rest of the brand.
They could still cross brand the MITB match itself (4 from Raw, 4 from Smackdown) while having Smackdown talent fill out the undercard. Just for the love of God, don't go back to the two briefcase format.
I wish they would do away with MITB altogether. It's been done to death, and between MITB and two world titles literally anyone can be a champion and it just makes everything feel so unimportant.
The one thing I haven't seen done with MITB, that I think would make it interesting again, would be to have a white hot babyface win it, and sort of like Bryan did back in 2011, announce his cash-in for next year's WrestleMania. Meanwhile, have him get involved in a feud with a heel, who coaxes him into putting it on the line and ultimately uses nefarious means to win it (ala Edge/Kennedy). But every time the heel goes to cash in, the face is always there to thwart it, eventually leaving the heel so flustered that he challenges him to a Career vs. Briefcase match at the Rumble or Fastlane. Babyface wins, and goes on to win their brand's title at WM. It would at least make things somewhat interesting and stop the briefcase from becoming a useless prop for months on end.