With PRT in the picture, there's more reason for a driveable Strip; I think that should be a high priority for Las Vegas surface roads. Extending Las Vegas Blvd. all the way to I-11, through downtown Las Vegas (ayckshully, the more famous part of the Strip is in the city of Paradise), would be awesome, and could maybe work if the city were stretched north a bit, but still might be a long shot with all the stuff going on there. I think the least we should get is between the Las Vegas Sign parking area and Sands Ave., but even then I'm sure a lot of stuff would get cut.
Another thing they could do is extend the Boulevard down to Primm, with at least part of it being secret; LVB goes as far south as Borax, and from there to Primm it's just dirt roads. This part of the Boulevard could also be accessed at Sloan, which has industrial potential (the deathclaw-filled quarry) and Easter egg potential (Speed Vegas). Speaking of eggs, I'd be over the (blue) moon if we got Goodsprings, or some other nod to Fallout: New Vegas. (I brought this up when we were talking about Chicago, but imagine if there were Easter egg AI vehicles that would only spawn in certain areas; in Vegas there could be a
red '73 Caprice Classic Convertible, or a
'65 Mercedes-Benz 220SE, to name a couple.)
The airport would be worth pursuing, IMO. In addition to that, between the 15 and the 11 are the usual box stores, supermarkets, and suburban housing developments that are kind of boring, but would help fill in that void. There's also the Sphere, and the
Las Vegas Strip Circuit in that space. Other than that, that inter-highway zone is kind of dead from a trucking point of view, so I can see the airport's cargo terminals being left out in favor of a more efficient use of the space.
Mentioning secret roads has me wondering now if the 66 between Barstow and Ludlow will ever be accessible. It's modeled, and I know someone here drove it, but it's blocked off for some reason. I guess at the time it was considered too redundant to I-40, but the eastern secret segment of the 66 in New Mexico hugs the Interstate too, so why not?