となるだろう

will probably become

→ と
phrase Rare #22,572
will probably become A somewhat formal way to say that something is expected or likely to become something.
JA: 彼は将来、医者となるだろう。
EN: He will probably become a doctor in the future.

こういった仕事は、プロの誇りとなるだろう。

This kind of work would be a source of pride for any professional.

その計画には多額の金が必要となるだろう。

That plan will require a large sum of money.

彼女は日本初の宇宙飛行士となるだろう。

She will become Japan's first astronaut.

それを仕上げる前に作業をやめる時間となるだろう。

It will be time to stop working before you finish it.

老齢人口は、健康管理にますます多くの出費が必要となるだろう。

The elderly population will require increasingly greater healthcare expenditures.