1.) This change is actually good for many elites (myself included) who fly shorter routes on higher fares. Also getting a huge boost is the elite who flies long haul on premium fares. So to assume all elites are with you on this is probably flawed. In actuality this change really benefits the groups United most wants to court. If it ruffles feathers of pax/elites on discount fares they are really probably alright with it.

2.) Given the above and the fact that Delta already is doing this I don't see any feasible way United would not switch as well. Considering the huge differential a person can earn on a front cabin fare internationally staying in the miles flow game would be suicide.

3.) The ship has sailed on this one.