I really doubt Frieza is going to kill beerus. Here is my reason why. Beerus says that goku is the 2nd strongest he ever fought. Is Frieza had the power to kill beerus, he would have been the 2/1st. Now what goku,whis and vegeta was watching was Frieza powering up to his final form. Beerus just woke up. I mean, I doubt when a dbz god wakes up from a 3 year nap they are instantly going to have the power to fight. Frieza training isn't enough to kill beerus. Honestly I don't see it happening