I assert that it will.
At the point where we get into a post scars meta, spell snare will hard counter (in no particular order)-
Vault
Oath
Demo
Merchant Scroll
Null Rod
Goyf
Leonin Arbiter
Sphere
Thorn
Chalice @ 1
Qasali
....
The list seems pretty long here, but the main ones of note for me are:
Spheres
Oaths
Vault
I do realize that most of the spells on this list get countered by Spell Pierce also, but Spell Snare hits the new creature that owns the crap out of sac lands, tinker...etc.
Discuss!
I am sorry buy you included only 1 card of Scards, namely Arbiter. So in a way you are saying; will spell snare be a hard counter because of Arbiter?
I think Spell Snare is very much playable and has been for a while now. Still, how good it is can vary. Sometimes it steals the game, sometimes it gets you a significant advantage, sometimes it puts you in the lead, and sometimes it just trades. I don't think it will ever be dead, in other words it won't stay in your hand for long.