That seems less likely to me. Why would you want the soloist to have to sight read incredibly complex material like that? I can't imagine a scenario where that would be required. At rehearsal, on the initial read-through, I think people would give him a break.Guys, would you include solo pieces as well? Dragonetti etc. What about the Tubin and Schuller Concertos..??
This thread is some good readin' right here. Keep it goin boys.
And yes, anyone who can't sight read Bottesini's Tarantella is a hack who should give up immediately. On the scale of bass grievances, it is on par with not using an amp.

