My god, that's ugly as sin......
You know what, everyone has missed a couple of points which I will bring up now...
1) Emissions, I really can't believe that you missed this!!
To be fair, it would be easy to get 2000 hp out of an 8 litre W16 with 4 turbos for that reason, it has 4 turbos so finding bigger ones isn't a problem and manufacturing stronger con rods etc, and also mapping it to be reliable. But it's VERY VERY hard to do all of that and pass current EU legislation of exhaust gas emissions and american ones (yes there laws are even more stringant) So the power bit can be done but I don't think currently they have the means to keep the ecomentalists off there back and realisticly the only way to gain more power without going overboard of emissions is more cubes and a lower compression ratio.
2) Where in the world could you run a car up to 300 mph? Better still though, what comes in to it as well is they would need to get it up to that speed as quickly as possible, so not only would it need to top 300 but it would need to accelerate far more quickly than any other....
3) Weight, I dare say the Veyron is so heavy so it can be completely stable at those speeds but weight means blunted performance so what do you do there?
4) Sheer madness......
Seriously now, do you really think the germans would have to stones to push the boat out some more? Sure they made the SS but that was only to say "We can do zis" However though, if you look in the koenigsegg stable though and see there latest creation...... they just want to go fast....
I think you'll agree though these guys have a fighting chance.....