Yes, there are less new startups today but if you come to think of it, we don't have a major innovation at the moment that's easy to jump into. Look at the late 90s, we had the INTERNET, anyone could make a website with frontpage or a little html tag understanding.
Then in the late 2000s we had the MOBILE PHONES... I have an idea for an app! (everyone did!)
At the moment, we have AI/ML but my opinion is that it's not ripe for an average person to start an ML company. Another major upcoming branch is blockchain but it's also not mature enough for this major innovation to trickle down a leaf tree of startups.
What do you think?
Oh, almost forgot to mention AR/VR! Not there yet!!