I don't think other wild animals will be able to master these types of words like the Wikie since the orca already knew a few familiar sounds that could imitate the words while other animals might not be able to imitate without using these type of sounds. The other wild animals might not be able to imitate the words either without some sort of reward I don't think.

I believe the predictions will come true since usually, these types of predictions are correct and unusually accurate.