Yes but if the other players are more proffesional nowadays, then so would he be too, and he'd be even better equpied to deal with it.
Sir Don was already known for his highly professional attitude.
In a sense he was ahead by a century.......its akin to having a modern day player in the days of amatuer cricket.
However, he too would become more professional. I am not denying that.
What i am saying is, Sir Don was highly professional in a very unprofessional setting.
If he played today, he would be a highly proffessional player in a highly professional setting...therefore the gap between him and his adversaries would close considerably.
Its like the difference between 9 and 7 and the difference between 9 and 5.
Nine is still nine...but the difference is bigger in the latter case....
Your record is a product of how good you are AND how good the opposition is.
Don's greatness doesnt change- he would still be the best damn batsman ever.
But the opposition's quality changes drastically. Therefore, i dont think he would average more than 65-70.