A few folks have popped in to ask why this thread has gone on for so long. For me, it's because halflings have become this sort of quantum concept that is everything it needs to be, when it needs to be.
Halflings are bucolic farmers that live peacefully, hidden from view, in small communities that are suddenly expert soldiers, effectively armed and trained and ready to battle invaders at a moments notice, using expert tactics while at the same time, completely normal commoners who just want a good meal and a quiet life who rise up to defend home and hearth but, despite loving home and hearth, refuse to return to home and hearth because they might leave their friends, even though the iconic halflings do EXACTLY that - go home after the threat is gone and abandon their new friends.
They are both heavily present in published material for 5e and strangely absent at the same time. They appeal to those who want simple, every man concept characters while being equally appealing to a broader range of concepts. On and on and on.
I mean, here's how the conversation has gone:
Me: I think that the PHB should reflect what people are actually playing. Any race that isn't getting much traction and isn't getting played very much should get punted into the DMG to make room for fresh concepts.
Response: Why won't you talk about gnomes. Gnomes are less popular than halflings.
Me: Are they? Ok, punt them too. No problems. Again, anything that isn't getting much traction should make room for fresh concepts.
Response: You only think that because you hate halflings. Why don't you just ban halflings?
Me: Umm, I just said that I'd punt anything that isn't making the grade. We can argue over where that grade should be, but, I strongly feel that anything that isn't making that grade (whatever that grade is) should get the punt.
Response: Why are you focusing on Halflings? Gnomes are less popular. You are only talking about halflings because you hate halflings.
Me: Umm...

Heck, other people have said it's okay to punt gnomes and I agreed with them. No one seems to have any problems with punting gnomes particularly or folding gnomes into halflings. Both options would likely achieve the goal of making halflings more played, so I'm happy either way.
Response: You are so focused on halflings. You must just hate halflings. Why won't you talk about gnomes?
....
Now, repeat that conversation about sixteen times and that's generally how this thread has gone.