I too have friends who have left the UPC, due to what I would call "liberal leanings".
Some have gone off the deep end and others have stayed true to the basic
Acts 2:38 message.
However, almost without fail, their children fall out of truth.
I do not see the UPC as becoming more liberal however, it seems to have stabilized after the loss of some to the WPF.
My vision may be somewhat skewed, as most of my UPC connections are in the South and Midwest.
But, I believe both orgs are doing fine!