Even if this is true from a technical perspective (which is not totally obvious) there are plenty of other barriers. Aside from the concessions Roberts wants to Sony's platform requirements (ex. the ability to patch quickly without the traditional platform approval process), there's the game itself and its many controls. Star Citizen wants to be a glorious old-school space simulator, with all the fiddly controls that implies. Try fitting that stuff onto a Dualshock 4. Even in that pre-alpha gameplay you saw:
multiple guns and turrets (though I don't know if we saw the turrets firing, but presumably you can unlock them from forward-facing if we did)
option for multiple missile/rocket types (HUD shows two missile banks)
decoupling of ship orientation from direction of ship travel and multiple thrust axes
So let's say you put the usual ship orientation stuff on the left stick. Triggers control guns and missiles. Bumpers switch guns and missiles, maybe. Turret unlock controls go on a face button (though that's a pretty minor op to put on a face button but whatever). Let's say Square for funsies. Decouple orientation on a face button (let's say Circle). Then for the various thrust axes, maybe the right stick controls up/down/left/right thrust (impulse controls only, not throttle) and then X and Triangle as throttle controls for forward/backward. You have four controls left over for the d-pad. Let's pretend power management is done there, so up/down controls what module to change power settings and left/right increases/decreases power. That's all the controls you have available to you.
Now where do you put squad communications and orders? Where do you put countermeasures? Does the game have afterburners? If so, where do those go? How do you target ships? Do you have separate controls for target nearest enemy/friendly/capship/etc., as has been standard in most space sims going back a decade and a half? The list goes on.
Chris Roberts has already said he doesn't want to compromise the game to bring it to consoles, but there would be a pretty fundamental control issue in order to do so. You could in theory connect a joystick and keyboard (or similar) to a PS4, sure, but who's actually going to do that? And if they already own a joystick and keyboard, what's the likelihood that they'd rather run the game on PS4 anyways?