I'd love to see Jack Whitehall on there, not because I like him, but because I'd like to see him mocked.
I assume Ricky Gervais wouldn't do it, but perhaps Stephen Merchant might be up for it - he'd be hilarious at some of the more physical tasks. Karl Pilkington?
Richard Herring and Andrew Collins would make a good dynamic having worked together for years, done a brilliant Podcast together and then fallen out, not sure why.
Loads of best moments - most of what Bob Mortimer did was amazing.
Just like to add I bloody love Taskmaster - it is absolutely hilarious, and a great family viewing programme, if you don't mind a bit of swearing, which I don't.