Bullshit. The story sections/missions map is a completely different structure than the Dark Zone, and it has nothing to do with PVP. The only thing you would lose by quartering DZ into a PVE and PVP mode is you wouldn't be able to steam roll noobs, you'd have to fight other super geared trolls.
The DZ just needs proper gear based matchmaking. It seems Incursions will add this new "Gear Score" to the game, and hopefully they can integrate that into the DZ matchmaking.
It really doesn't work well when a fresh 30 with blues and like 2 purples gets killed in a second by a group of 4 running 170k+ Vectors.
It doesn't make any sense, that isn't lawlessness or the wild west. It is unbalanced gameplay. Destiny turns off all power advantages in its PvP mode except for Iron Banner.
Going Rogue last night was only really engaging once out of the 4 or 5 encounters I had. Most of the times they were underleveled and unprepared and died in a second. It wasn't until one group that had a decent build (you could see their weapons and armor were HE items) that gave me a fulfilling battle.
The DZ needs this type of matchmaking to make newcomers to the DZ not have to deal with overpowered players and to make going Rogue more challenging and fulfilling.