don't forget you need to be booked in "H" or higher to use miles to upgrade on an international ticket.
All that UA is doing is making our miles MORE valuable. A domestic r/t UG in F costs you 30,000 miles, while an XF seat (Award First) is 40,000 miles.
I'm a Premier Exec and I've *never* had to buy 500 miler upgrades.... so it doesn't effect me. I think I have like 30 sitting in my account.... never use them!
anyway, if United thinks this will help them, so be it.