The way its played out has certainly been strange. But the original rationale made sense and some pretty good judges thought he'd be successful. I remember Slater saying at the start of the year he thought Roger would become one of the game's elite centres.
And I think the idea still has a lot of merit, if its executed better i.e. letting the guy have an extended run in the one spot.
I mentioned Meaney in another post as a good example of someone who was asked to change from fb to centre this year but been allowed to settle into the role. The guy is just as versatile as Roger, the Storm have had a number of injuries amongst the outside backs he could've covered, but Bellamy resisted using him as a short term band aid and instead invested in the longer term benefits.
But if Webby isn't willing to do the same next year, then IMO just shift him back to where he's most comfortable. Otherwise what was the point in signing him to start with.