I think some of you are missing the point. I'm not saying D&D as a whole shouldn't have all manner of wacky races and classes available, but to those of you talking about Arduin, what say we put Flying Sharks in the 5E core as a race?
FR, GH, DL etc. now get Arduin Flying Sharks as a common feature, as do all your home-brews unless you explicitly ban the things. They begin to crop up everywhere in the PHB artwork. They get retconned into Dragonlance Chronicles when that gets re-released, and float around through Waterdeep and Greyhawk. Flying shark NPCs feature in adventures for PCs to talk to.* Ironically, Arduin itself begins to feel less special a world because one of it's unique features is now overexposed.
OR...
We could put it in a supplement, for those worlds where you simply gotta have a flying shark as a playable PC race.
Hmm.
By the way, to clarify another misunderstanding, the dealbreaker for me was a bad selection of races and classes in the 4E core, not silly weapons, which are indeed much easier to remove (even if I still don't think they belong in the core, ideally). For me, it's simply much easier to pick up an earlier edition than fight whatever 5E wants to be, in this respect, and I doubt anything mechanical it brings to the table will compensate for aesthetic problems with the core, if that ball is fumbled again.
*: Yes, I'm aware that Arduin flying sharks are as savage as normal sharks and do not speak. I'm citing a hypothetical PC race flying shark that hangs around in taverns and chats, and is somehow socially acceptable, just like 4E's clearly monstrous dragonborn.