I think the $750-800k mark is about right for Dugan, however telling him he is a centre only is one of the dumbest moves they could make. He is stil the best fullback option in the club and that will stay that way for the next 2-3 years unless we go and recruit someone, which we'd be silly to do.
He is the best defensive fullback in the game, and defence is 50% of what happens on the field. His positioning, work under the high ball and ability to clean up grubbers is second to none.
With ball in hand, he is still incredibly effective. Don't confuse lack of try assists with inability to create for others. The metres and quick play the balls de generates would do wonders for a decent set of halves and a coach with half a brain. And his individual skill set is still top shelf - see the McInness try against Pennies, he didn't get the TA but that try was 100% generated by Josh.
And this is to say nothing of the leadership and drive he brings to th team. Something we won't get from Field, Duffy or any other combination of 20yo kids for years.
He is the type of player you build the team around. With a controlling 7, half decent 6 and centres with some brain cells (like Mann and Milne) then Dugan would flourish (plus a coach!). He's got gaps in his game, hence he won't get that $1mil, but those saying that he is a centre only, not worth more than $600k or that Dufty/Field are better options are out of their minds.