We really shouldn't be going down that route. I know politics nowadays is more about the personality rather than actual policy (what can we do it's a by product of politics in the television era). But going so far as to get in "well known" faces just to prep up the party for seemingly PR purposes would really be a step in the wrong direction for the Labour party. Labour really needs to become a party that focuses solely on policy and critique, playing popularity politics going into the next general election isn't going to hold them in good stead.
If this particular person who becomes the next leader knowns their stuff and is on point then fine, but a picking a person for the sake of who they are would be a complete waste in my opinion.
But that's the nature of politics today, so I'm sure a "face" is really what they're looking for.