Pepi is basically right although a bit harsh.
The only 2 clubs that would have the vacancy sign up for a slowish fullback, under 25, would be the Titans or Sharks. And really that's not much to "test the open market" with.
Hoppa may get his speed back in a year or 2, he may even get better at fullback.
But his form years were on the wing, where the pressure isn't on really on defence or organisation. Playing him at centre helps with lack of speed and probably will be his best position going forward.
Eels playing him there is a bit silly, but the Norman fullback, Hoppa centre, Foran 5/8th will play out and be a good option. But 2.4 mil on 3 players is gonna cause problems for them in the future.