Watched this last night and it was obvious that Patrick was not capable of doing much more than getting a few words out. The rest of the programme was filled with the beginners' class and old clips.
It would be a massive mistake to dump it now. It won't be the same without the Old Man, but there are a handful opf people who could do a good job.
Edit. Oh God, I've just had an awful thought - given the way the BBC thinks nowadays, are we going to get one of their 'team' programmes, with 'lively' young people (with a carefully-picked ethnic mix) getting all bright and enthusiastic, rushing around and doing experiments that look like they've come from a schools programme?