I'm gradually becoming acquainted with the period through reading Michael Hicks' book.
From what Hicks says, I'm unconvinced that York is going to make a particularly good king. He lacks the support of the realm's major nobles, and doesn't have a tremendous amount of popular appeal either. His solution to the crown's crippling financial problem seems to have been little more than repeated attempt at "Resumption"; the withdrawal of grants of crown land to court favourites. Now, this was undoubtedly a problem, spurred by the innate generosity and benevolence of Henry VI personally, but it was only a peripheral one: Hicks suggests that even if York had been successful in Resuming all crown lands it wouldn't have been anywhere enough to put the crown back into the black.
The real problem in the 1450s is the fact that the English Crown is trying to fight a war in France without Parliament being willing to raise taxes to pay for armies. York's revolts were all about removing those few men who saw the basic truth of that matter, and until York and his allies realise the real reasons behind the fiscal difficulties of the English kingdom then there will be more difficulty ahead.
When I have finished Hicks' book I may look back on this argument and laugh at its simplicity and lack of understanding, but we shall see. Currently I'm up to the final Yorkist revolt of 1459, so I've only read about the background to this proposed PoD so far.