Looking at how The Tonight Show played out in America, I think the show might actually benefit from A&D playing to the crew similar to what they do in Australia.
Problem is that unlike the late night shows in the US they're not really telling jokes as much as presenting. It's not quite the same
Plus those late night shows have a massive number of staff, and a smaller studio.
They'll get by and it'll be entertaining, but it won't be enhanced by not having an audience. Luckily for them they've been doing a lot of NTV style hits so that will be very useful