This is the 14313th most frequent Turkish word.
olacakları
"Olacakları" means "what will happen" or "things that will happen."
Here, 'olacakları' is used to mean 'what will happen', serving as a noun phrase derived from the future tense of 'olmak'.
Yarın olacakları kimse tahmin edemez.
Nobody can predict what will happen tomorrow.
In this sentence, 'olacakları' functions as a direct object to the verb phrase 'to consider', again referring to future events.
O olacakları göz önünde bulundurmalıyız.
We should consider what will happen.
Here, 'olacakları' is part of the clause indicating the things that are going to happen, framed in a context of pre-arranged plans.