The people who watched this TV show in the 60's are now in their 60's I think most of this audience would want to see older
actors as the main characters not kids who cann't act ( just pose ). This is why so many actors in their 40's, 50's and 60's are
still around and getting work. Like Tom S. Sean could definitely play Illya, but I think he would have alot more sex appeal
then the original actor had!! I'm a little surprised that Clooney didn't take this job I think he's better at comedy then drama.
Just watch OBHAT and you'll see what I mean. He many not want to be in the same movie with Sean, maybe that's the reason.
However with him out I cann't think of another older actor that could or should play Solo.