Yeh its a real shame surely they must be somthing they can do to improve safty in regards to riders being hit by other riders.
Other than faster response from the on track medic and stewards, there is literally Nothing one can do.
Motorcycle racing is The Most dangerous competitive sport on the planet. If a guy gets hits with a 200kmph bike, take in account the momentum of that thing at that speed, and the impulse impact thats its going to give,
only one thing to say These riders have got balls to do what they do and just about anybody can't do what they do.
Racing cars have become safer throughout the years but i am afraid it cant be done to bikes and thats part of the reason what makes it exciting as well(tragic in this case of course) pity that bike racing should be rated higher and followed more than car racing i feel personally. Part of the reason car racing was so popular and exciting in the past was exactly because it was dangerous and people knew this fact, now you see Webber's crash as a Evel Knievel-esq crash test for a movie or something.
Sorry if it came of as insensitive (not the intentions at all) but thats just how i feel and some past era drivers of car racing feel this as well. the Danger is gone, absolutely.
Only way one can die in a F1 car these days is of old age i guess.