Yes, it certainly would cause a sensation if explorers did discover Noah's ark (which is described in chapters 6-8 of Genesis). And yes, it might make some people take the Bible more seriously.
Whether or not this will ever happen, however, remains to be seen—and even if it never happens, God has already given us more than enough reason to trust the Bible. For example, within the last century or so, archaeologists have made hundreds—even thousands—of discoveries that confirm the Bible's historical accuracy. Some written records from ancient libraries even recount events that are also told in the Bible, or give the names of kings or other people also mentioned in the Bible.
In spite of this, however, many people still ignore the Bible or even reject it completely. And truthfully, even if Noah's ark is discovered one day, some people will still reject it. Why? The reason is because they don't want God in their lives. They want to run their own lives, and they know that if they took the Bible seriously, they would have to submit their lives to Christ.
Is your faith firmly based on God's Word, the Bible, and are you seeking to follow its truth? The Bible says, "As for God, his way is perfect; the word of the Lord is flawless" (Psalm 18:30). Make sure of your commitment to Christ, and then let His Word guide your steps every day.