Frank Isola of the Daily News reports:
That's an interesting admission for Walsh to make, especially given that 1. He's ostensibly not hiring and 2. There have been previous indications that Allan Houston or some other current member of the front office would be Walsh's eventual successor. Meanwhile, Marc Berman notes that Mullin is quite familiar with a number of current Knicks.
Anyway, this doesn't appear to be a pressing concern, but it's something to file away.