And while you're considering those, consider if the airlines should be allowed to change without a year's notice (as they did):

*The required mileage for top elite level (changed in October for the following year)

*The ability to obtain no blackout rewards at reduced mileage (changed in October for the following year)

*Upping the minimum fare basis allowed for international upgrades (change announced in the summer for effect in October)

*The entire process by which upgrades are granted (chenged immediately and without notice)

*The rules for standing-by for international upgrades (chenged mid year without notice)

ETC....

I know only a few policies that changed from one airline, I'm sure others could add to that list...

So, yes PG, I would take the trade-off of the few marginally benefitial immediate changes for the lock-in of programs that do not pull these suprises.