Another factor as to how Piggy's character has changed for the worst in recent years:
In the past, Piggy DID care about the other Muppets in addition to Kermit, even though they annoyed her, and did have compassion for them and others (like with the octopuses in the James Coburn TMS episode and with Beauregard in the Joan Baez TMS episode).
Even as recently as VMX and TM, she admitted to loving the other Muppets like family and regarded them all as her friends. However, in some recent appearances, including some promos for TM, she said that the others were only Kermit's friends, not hers. That's quite sad and something that really needs to be corrected, since ALL the Muppets ARE her friends and she does care about them all deep down.