The newer players have optimized their style to gain "victory" as defined by the game (perks, boast messages, map resets, and denying the enemy of same). HO-ing, vultching, porking, and The Horde are the path of least resistence to these ends. Not necessarily the most efficient, mind you, but the ones requiring the least effort and/or thought. People do it because it works and its rewarded.
The problem becomes that the longer this persists, the lower the bar gets set in terms of skill. That is, if all you do is horde and pork-vultch, then when confronted with a stand-up fight you either have to run for the safety of The Horde, or go around it so you can hit the runway. And if half your kills come from HO'ing then there's not much need to learn anything else since you are "winning" often enough.
Which is more or less what we're seeing now.
I'm hoping once CT is done HT can spend some time making changes to the MA to shake things up a little.