I'm ambivalent about slicing, but I'd question making statements like yours and presenting them as fact. Could they have caved to all the whining? Yeah. Could it also have been that people play a release client a great deal differently than beta? That they got numbers back that were not in line with their overall goals? These are possible as well.
I know of no person that created an army of alts just to run slicing missions in the beta, but I know of a few that have in release. Money was worthless when the delete button was hovering overhead at all times.
Could be that it has nothing to do with the money at all, and they just want to encourage people to take up the other crafts. If they see that a high percentage of people are taking slicing over anything else then it's also in the interests of the game to change it.
I suppose my point is that we don't know why, and a week after launch means they have live server information to base the decisions on. They didn't have that before launch.