No. There is no path from Jenna Marbles to the traditional kind of television that the author is used to. They're just...different. Jenna has a specific way that she likes to create things and more money doesn't necessarily change that.
To make the kind of TV that the author imagines, you need to drop some money up front. Let's be charitable and say $300,000 for a pilot. Needless to say this is out of reach for almost 100% of the content creators on Youtube, so it's unsurprising that the content that has risen to popularity within Youtube has its roots in methods that cost essentially nothing.
Now, there are some interesting exceptions. The Lizzie Bennet Diaries [1] was nowhere near a "real" TV show in terms of budget but it had writers, production staff, and hired actors. Vice produces a lot of content that seems like it could fit into a normal TV program [2] -- almost. There are some other interesting shows that are sort of half-way there (well, more like 1/10th of the way there) in that they actually have production crews and do things like post-production (see: Wil Wheaton's Tabletop series [3]). I'm sure there are a ton of other examples.
So, the community is sidling up to high-quality content, but it's still unclear exactly how they're going to get there. By my estimation, to create a "TV-ready" drama, you'd need at the very least 100k subscribers paying $3/mo. Obviously no one is going to sign up for something if they're never heard of you, so you've got to make some free content that people love, then maybe make the jump via a Kickstarter? Or will true "channels" appear that bring the money and the subscribers and that then fund the shows of their choice? This is a really fascinating time for video content -- I'm excited to see how the economics end up playing out.
[1] http://www.youtube.com/watch?v=KisuGP2lcPs&feature=c4-ov...
[2] (Warning: NSFW) http://www.youtube.com/watch?v=JsUH8llvTZo