Virtua Fighter's "pizazz" comes from the character customization. VF5: Final Showdown has the best customization in 3D fighters. You can make Akira look like Ryo from Shenmue, Sarah look like Ulala from Space Channel 5, and you can make El Blaze look like a Samba de Amigo character; and those are just the customizations that reference other Sega games. Certain wearable items give characters special winposes, and each character has a wide range of customizable items that are exclusive to that character.
Tekken's customizations currently pale in comparison to Virtua Fighter's. Tekken 7: FR might change that, but VF still reigns as the king of customization.
In my opinion, VF doesn't really need that much "pizazz" to be successful. VF needs to be the one fighting game to not be very flashy. Tekken and DOA are the 3D fighters to have the razzle dazzle. VF is like a fine wine. Every mechanic comes together so well. Each character's personality shines through in their fighting style, not a story mode.
VF6 can be the same as VF5: FS, just with a graphical overhaul and 2 new characters, and people will pay attention to the game. You don't need flying demons or bipedal race cars to make VF a success. It just needs to continue to be as it is.