Group Slayer isn't off the cards for the team, just that it's beyond the scope of Project Rebalance and probably wants to be a project all of its own. It's something we talk about a fair bit, but there's a lot that goes into it to try and deliver on the fantasy of you and your pals squadding up to dish death out, versus making it abuseable in a bunch of unintended ways.
Not off the table, just beyond what Project Rebalance is supposed to be!