With social media emerging like Facebook Meta, Bing, Instagram Reels, Snapchat, Pinterest, YouTube, Twitter & LinkedIn, will we witness a prominent rise in content writers?

Absolutely.  With out question as the platforms grow and give people a voice you will see even more content writers who can get their thoughts and idea out there in more ways and they will be able to reach more people with out having to do more work. 

Yes, especially since ChatGPT is now easily available. What we may also witness is verbose passages of text that say in 4000 words what could have been said in 400.