As you know, "be used to" refers to the state of being in a certain habit, while "get used to" refers to the process of acquiring a habit. We can imagine contexts in which both "will be used to driving" and "will get used to driving" can work, for example:
He is still afraid of driving, but I imagine that in a couple of months from now he will (already) be used to it (to driving).
He is afraid of driving, but I bet he will get used to it (to driving) after some practice.
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