Tormin DOES NOT need nerf! as matter of fact His attacks hit only around 1/10 of other strong champions(Turv/Mking/Baron/skull etc), he only brings new and fun utilities to the game. He makes this game fun and not boring like 1-2-3 fall to sleep arena fights.
There are already many many counters to Tormin like adjust your team to not have any auto heal, limit your buffs, control your speed boosts, use immunity sets. Also Tormin has many counter champions that will do well against him like any champions with dispel/block debuff/. And not to forget there are so many CC like Taunt/stuns/fears that can totally render Tormin useless.
People are just lazy as fk, they dont want to adjust their champions/gears to make a different, they kept complain about game is boring and lack of variety, now there is a chance for a variety to shine they cried to take it away because they don't want to think and work harder to adept.
Think about it! Do you want the arena fight to be forever Arbiter + nukes' 5 second fight? do you want to play/watch same old combination of arena teams doing 1-2-3 everytimes? Do you want to encourage developers to be more creative and more strategic for the fun/longevity of this game?
Nerfing Tormin will have serious impact on Plarium's reputation and revenue as so many players have already believed they had been "bait and switched" by Plarium's shady sales practice, the game is finally growing after a year, they can not afford this kind of chaos. Just leave Tormin like it is I can bet you within a month when players figured out all the counters all cries will die down and players will start to appreciate the new arena variety.