#7 Interim Champions
It's a longstanding internet wrestling trope that vacant is essentially an inanimate title-holder itself, due to how often WWE championships are stripped from their owners due to injuries, releases etc. and essentially given away to vapor. Rather than leaving titles empty-handed for extended periods of time or conduct an exhausting tournament at every moment, a reigning champion can't perform, wouldn't it be a better idea to have interim championships?
That way, not only is there always a champion at all times with a strap around their waist or shoulder, ready and able to represent the company, but it prevents undeserving contenders from assuming the main title without having earned it, and provides the opportunity for a blow-off match for an Undisputed Championship if and when the pre-vacancy champ returns. Champion vs. Champion pay-per-view matches have money written all over them.