Just an educated guess but I think now solving problems which will be revolutionary in nature is just beyond the means of one single person simply because they

Just an educated guess but I think now solving problems which will be revolutionary in nature is just beyond the means of one single person simply because they are way too hard for just one Genius to solve it- so we don't have a famous Newton or an Einstein of present age and instead have lot of people working on lot of small chinks of the bigger problem