The logic that making people pay will somehow negate the negative perceived effects is baseless I believe.
What causes the stand-by line to slow is simply volume of FP returners. Simply charging does not reduce those returners. You have to limit the # of returners. That means limiting the amount of sales of FP. Then, you have the new problem of fighting and struggling to get an opportunity to buy the FP before they sell out. That means you then have to price the product high enough to balance demand with supply. Otherwise, you simply have a new struggle like the 180day Cindy Castle reservation problem... FPs selling out 5mins after they are available.
Simply charging for FPs will do nothing to cure the problems people perceive about FP - it will simply make the Disney product less affordable to those who dream of vacationing at Disney. The solution is to control the amount of returners - you can do that with the system as designed today, or you can cut back how many you distribute. Distributing free or by pay - they both rely on limiting # of FPs.
I still dispute anyone who thinks 60+min standby waits are only a product of FP. Disney is the king of lines.. Anything UNDER an hour on prime attractions was like winning the lottery in just about everything but off-season.