Experts claiming that Bitcoin will become worthless have the same amount of credibility as experts claiming Bitcoin will hit $100,000 in 2019. It's pure speculation being used as clickbait by financial news outlets.
I don't do parking with ads anymore. It's annoying and a waste of a good domain.
Nowadays, I either:
Develop a website with content and promote products or sell guest posts.
Point the domain directly to a sales page.