I really don't see the issue here... a stock road bike will do 186mph every day of the week and feel stable and rigid whilst doing it. Think of the physics for a second, straightline speed on a motorbike is so locked in, turning at anything over than 120mph requires body weight shift.
The only problem is slowing down from that speed, but these guys are proffesionals, i have been 180mph on public roads a good few years ago, its not something thats right or smart, but from my daily use of a superbike compared to a top moto-gp rider, i would say we shouldn't worry about these guys not being able to handle it.
I would like to see something like 300mph, 230-240 is just too mundane, the 2000 Suzuki GSXR-1300 hayabusa will do 220mph in stock trim, as performance bikes proved down the road that my office overlooks.
And slowing down F1 cars was only ever about cornering speed.
Also, it is fine to crash at 200mph on a motorbike on a racetrack... so long as you dont hit anything.
http://www.crash.net/motogp/racer_bio/9 ... akano.html
There need to be more events like the TT, northwest 200 etc... since the fall of the 500cc two strokes, moto-gp has become a very weak sport, big wide tracks made for f1 cars, its boring. Lower the top speed and you'll kill the sport off once and for all.