one thing that I wouldnt mind seeing is increasing the segments required on United metal or at least putting in a mileage component from the current four segments.

25/50/75/100 is gonna stay unless the competition makes a move as well.

Another thing I would also like to see is that the mileage go to the entity that is actually paying for the ticket, and not the pax flying, to be used at their discretion. But that would be nearly impossible to implement.