By today's standards they do. Why do you think we can't use them in Photo Mode or get close them when attempting to take pictures of them in a race? They're never going to get away with putting standard cars in another GT game again, plain and simple. Especially with standards making up the car list.
...And doubly so if GT6 does indeed end up on the next-gen Sony system. Using PS2-era assets is already practically unheard-of in this generation's racing games, recycling them for the next-gen would (deservedly, IMO) turn PD and GT into a laughing-stock.
Premiums are the only logical way forward, and I don't even say that with a mind on Photomode eyecandy; multi-piece models allow better damage modelling, better visual upgrade options, and proper, non-cardboard-box interior views. Whether or not some people personally care for any or all of these isn't the issue; much of the rest of the genre has adopted them, and they're not possible with the awful outdated Standard way of modelling (single-piece car models with painted-on shutlines). Some of the Standard models are older than a decade; it shows.
Yes, technically, Premiums would be "last-gen assets" on a hypothetical PS4 GT6... but then again, if we're to believe Kaz, he's already said Premiums are "too detailed" for PS3, anyways
. The model quality of some of them might need some improving (the Gallardo's wheel-wells are not on par with something as finely wrought as the LFA's amazing model), but touching up the existing Premiums would be quicker and arguably yield better results than trying to Frankenstein the Standards into anything remotely presentable on a new system in 2013/2014.
Also,
dudejpo, modellers =/= programmers. Hiring more programmers
instead of modellers would achieve what you're suggesting, but not having a modeller do modelling work doesn't mean they could simply move over to programming things like physics, for example. I'm surprised one would give that title to EA willingly, too. I've been a critic of my fair share of GT5 features, but even I will admit in the console racing world, their lighting engine still sets the bar, and their modelling quality is right near the top too.