Also, I love uselessly speculating! So, here's the list with speculation as to whether the unicorn will last in the next 5 years or wither away:
1. Uber - will be alive and be doing extremely well
2. Xiaomi - will be alive and doing moderately well
3. Airbnb - will stay, regulations will put a damp on its operations
4. Palantir - will downsize; other companies will emerge and compete with it
5. Snapchat - (ad-funded) will fail to find a sustainable monetization model
6. Didi Kuaidi - (Chinese 'Uber' clone) will be alive and well
7. Flipkart - (Indian e-commerce site) will be alive and well
8. SpaceX - will fail
9. Pinterest - (ad-funded) will stay just barely, will downsize
10. Dropbox - will fail
11. WeWork - (home:AirBnB::office space:WeWork) will be alive and well
12. Lufax - (Chinese finance marketplace) will be alive well
13. Theranos - will fail
14. Spotify - (~ad-funded) will fail
15. DJI - (Chinese company that creates unmanned aerial vehicles) will downsize
16. Zhong An - (Chinese online insurance firm) will be alive and well
17. Meituan - (Chinese retail service site) will stay but not strongly
18. Square - will fail
19. Snapdeal - (India's shopping site) will be alive and well
20. Stripe - will be alive and be doing extremely well
edit: formatting