Not so sure
If Newton were alive today, I frankly doubt that he would have accomplished anything that would keep his name in the public mind for hundreds of years. As science gets more specific and esoteric, it becomes dramatically harder to make vast public discoveries that sound wowee-zing to the layman.
The alternative to calling people like him a modern day Isaac Newton is saying that we don't have any, and will, most likely, never have one again. Name one living scientist that more than, say, 5% of the US population can actually name off the top of their heads. And that's while they're alive!
Your alternatives are:
1) people are stupider today, universally. Or,
2) It's so much harder to make a useful discovery today that the people who are as smart as Newton, or nearly so, are reduced to nibbling at the fringe of knowledge.