I think it's really presumptuous to think des won't ever go back. That's his club. I always envisioned him giving us a premiership and then heading back.
He has enough money already. Probably enough to coast for the rest of his life, so why not devote his time to rebuilding something he loves?
The young talent, ie lichaa, rona have signed because of des. Look at how we nearly bagged Foran. Look at how half the dragons followed Bennett to Newcastle. That's the biggest risk with des and always has been, we could go from powerhouse to shithouse within 2 years.