As Patrick often said, the longevity of the show was down to the fact it was cheap.
There is no doubt that Chris was Patrick's chosen successor, but I suspect that this was made before Brian became more actively associated with astronomy (and indeed with the show)
My preference is for Brian, assuming he is okay at being a presenter which is far from a"given". Chris is okay as a presenter, but not brilliant, more of a "expert correspondent"
What we need is another Patrick....but there isn't one, and that is why his death was a sad day for astronomy
Could the show continue from Patricks old home? It appears Brian is looking at options what to do with it, and it has a poignancy for it to be still used for the show..