The Veyron is a bit of a funny cookie in my book, it's trying to be the fastest car in the world, yet be comfortable and fit all those other requirements you mentioned. You would think something aiming for such an ambitious title would be more focussed. I can only wonder what could have been achieved if the car was built solely for the purpose of taking the crown, im sure we could be biting at the heals of 300mph by now (I awaits to see what the landshark can do)

Im sure some car will come soon and obliterate the Veyrons record with a quarter of the complexity.
Anything can take the crown of speed these days. You'll see many cars do so as time goes on & technology advances. Hell, you might even see Bugatti change with it.
But the Veyron will always have something it started, something that places it next to McLaren. The F1 & Veyron were never intended to be
just fast cars like the SSC & the Vector; they were built to be a driver's car & a car that was reliable, comfortable, usable, as Dave said. These features are what sets them apart, what makes them rewrite history. Speed is nothing than a bonus, a basis for their design.
Ferdinand didn't design the Veyron to just take the McLaren's crown; he just set the speed as the benchmark for what he to accomplish. He essentially said to his team, "This car
will be faster than the McLaren. Your job is not only to accomplish this feat, but you must also make it comfortable, reliable, & usable at all costs". And he did so (as seen with the losses they take on each car).
I know it appears I am rambling on & repeating Dave, but when I think seriously about the Veyron, I see it as a car that did everything it was meant to be, with no corners cut at all. The car just simply re-enforces the idea to me, that with enough patience & time, a manufacturer can really come along with something new that sets itself apart.
And unsurprisingly, it's just 1 more trait Bugatti shares with McLaren, and why they will always be 2 of the world's most influential & unique cars.