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ものになるだろう

will become

→ 物
phrase Rare #37,013
will become Used to predict that something will become or turn out to be a certain thing or state. だろう adds a sense of probability or expectation.
JA: この経験は将来、貴重なものになるだろう。
EN: This experience will probably become something valuable in the future.

その財産はすべて彼の娘のものになるだろう。

All of that property will go to his daughter.

大気汚染は我々の生存を脅かすものになるだろう。

Air pollution will threaten our survival.

今日の試験は君の将来にとってとても大切なものになるだろう。

Today's exam will be very important for your future.

被害額は相当なものになるだろう。

The amount of damage is likely to be considerable.