Medical doctor Elisa Medhurst's blog on Huffington Post asks this question. Apart from the number of baby boomers getting old, she suggests that there are three main reasons:
1) The decline of the power of dogmatic religions.
2) Quantum science is challenging outdated materialism.
3) "Now, the Internet helps us create micro-communities where we can share those “paranormal” experiences in a safe, anonymous place free from scorn...even physicians have become emboldened enough to share the “paranormal” events they’ve seen throughout their careers during the dying process of their patients. Beforehand, they would have feared the ridicule of their peers, who were probably sharing the same secrets." Read more.