I was going to vote on this when I read through the options and decided it was a great way NOT to write a pole. It's extraordinarily biased.
So instead I'll answer the question:
From the OP:
If damage on a miss was included as an optional ability that no character had to choose, would its inclusion cause you to not purchase 5e?
If Damage on a Miss is included as a mechanic as part of the core rules it will make me wary of the game.
I wasted hundreds of dollars on 4e on products that I'll never use again and never got my money's worth from. The spine would still crackle if you opened some of them.
And I have several RPG products I do want to use. I have two Paizo APs I want to get through, and while I could convert one or both to 5e it's significantly easier to run them as is. I'd like to get in a mini-campaign if
Shadows of Esteren sometime and once the Fate conversion of
Eclipse Phase is released I'd like to give that a go.
Meanwhile, WotC has managed to move D&D from "must buy, sight unseen" to "I'll read some reviews and maybe check out a friend's copy".
Add to this my plan to go to GenCon this year, in the hopes launching a new edition
and having the 40th anniversary of D&D will make WotC step up their game and put on a great show. And any money I can save between now and then will help.
I'm already on the fence. While DoaM is just one mechanic, if it's baked into the core rules then there's likely some other stuff I don't want. There'll likely be other assumptions or power design that makes me iffy.
DoaM might become my canary, my quick reference to see if the game is going to be something I'll enjoy or something I'll regret purchasing.