It's not hope that grows a channel or keeps it alive. It's about loving what you do. Filming, editing, animating, whatever it is you like.
Unless you're already famous or well known you don't go into YouTube expecting much. I'm willing to bet anything that YouTube hasn't even found some of it's biggest stars yet. Hell even Pewdiepie has said (I believe on Ear Biscuits Podcast) that the biggest YouTuber in the world is still out there somewhere and that if he didn't exist someone else would be in his shoes right now. People are searching for entertainment more than ever these days so the channels who put out good content CONSISTENTLY will always grow eventually. It just takes time for the audience to find that content.
Think of it this way, every year technology reaches more and more hands, some who have never even seen a YouTube video before. And every year another massive group of kids are growing old enough to have their own computers, phones, ipods and youtube accts to sub/watch whoever they want. You think most kids of today even know who Ray William Johnson is? Or Fred, other than from TV. Or even that Justin Bieber started on YouTube. No! They're just watching whatever is popular at that time. Look at all the minecraft youtubers of the last couple years.... There's a reason the huge channels of years past are being destroyed in growth by all these young channels today. Tech is in more hands today than ever. And tomorrow it will be in even more. In an entire month YouTube supposedly has 1B active viewers. That's what, less that 13% of the planets population...
Heads up, because the days of internet success are just starting.