Not so fast
I don't know anything about Triond. But I can tell you HubPages will be around for a long time. HubPages.com is extremely profitable and their owners/ CEO's are millionaires.
Yes, some of these sites closed. Some have been around for a long time such as Squidoo, Associated Content and others.
I know a few people who make very decent cash on some of these sites. Also, these sites are good for promoting your business, product, service or even yourself. So even if you don't make money directly, you can generate a lot of traffic to your personal sites.
It all depends on your skills, abilities and what you plan to accomplish. Publishing a book is a huge risk as well. Many people go bankrupt paying to self-publish or spend many years trying to find a publisher only to fail.
I've heard negative feedback about Triond. I think you will be better off on HubPages. HubPages and Squidoo are free to join.
Also, on HubPages you retain full rights to your content and control the amount and types of advertising.