My motherline is mtDNA K1a, which also had a Neolithic entry into Europe. I don't believe they declined, which is the source of my question. It has seemed to me that maternal lines, whether Paleolithic (like my wife's U5b) or Neolithic (like my mother's), seem to continue on through the eons while their male counterparts disappear or are greatly diminished.
True. Although it looks like you have a neolithic y line. I think what Indo-Europeans did to Europe is pretty unique. Usually older lines get absorbed but in Europe Indo-European R1a and R1b pretty much replaced most lines at least in the North. However, I think their original lines were subclasses of U2 which aren't that common either.