I really hope Preseason causes Teamfights to become longer and more skill based
Currently games are decided in a matter of seconds, sometimes even split seconds as Teamfights usually just revolve around who can kill the enemy FASTER, unloading ALL the damage instead of playing around, timing shields, spells and so on.
I really hope with Tanks getting buffed, Assassins getting their burst windows extended and mages getting hit by lowering the burst on Rylais/Protobelt teamfigthing actually becomes enjoyable once again and last more than two seconds.
Currently the team who manages to burst faster wins, period. I'd very much want to see a meta where CC'ing the right person, peeling, engaging at opportune times and knowing just HOW to team fight besides just blowing every CD and hoping for the best
+35%
+40%
+45%
+50% 

and if they aren't crit then toss on
.
or has
,
and 
Stun a team
Even better when you cancel a Jhin or Yasuo ult with it