My fear is that DPC sees it the other way round: forcing us to pick a girl early will encourage the player to cheat as time goes on. By giving us a long time to be frustrated/bored at the need to constantly turn down all the side characters, we'll help kick off the drama he wants when our chosen relationship hits the rocks at the end of Season 3. That's not to say it's a complete trap. There will be some wiggle room and I'm sure we'll get warning signs before we really screw anything up. And there will be a way to patch things up with out chosen girl - or a different girl, like Quinn or Zoey - in Season 4 (though possibly not both Maya and Josy). But the goal is to make it hard to stay loyal.
I think that's why we're getting characters like the Vixens. They'd be ideally suited to throw themselves at the MC without worrying about the collateral damage to his relationships. It will probably start on the acceptable side of the line (heavy flirting, exhibitionism, and flagrant abuse of 'party' loopholes), but escalate as the season winds on. Combine that with the natural appeal of other side girls, the faults in the MC's chosen branch, and the ticking sexbomb that is Zoey, and DPC will get the drama he craves.
Personally, I think that would be a miserable way to follow up the crossroads; it's a big part of why I'm so down on the end of Season 2. But it sure looks like that's where we're headed. We'll have to see what happens when Episode 9 finally rolls around.