The concept of "digital product" is flawed, as it implies scarcity, which is obviously artificial and mostly based on regulation (e.g. copyright law). Instead, you should sell digital services.
I think we may be entering a digital dark age, where in the not too distant future, a lot of the software of today will no longer be useable. There will be no DOSBOX equivalent to play web games of 2014.
I don't see the problem with having a hybrid system. Just because some music os sold as MP3s, doesn't stop anybody from releasing crowd funded music.
I mean, I put all my books for free online. But I'd still rather be able to prevent others from using them commercially. I'd never have written them if a better funded competitor could just take them and provide them for free and outrank me.
http://lsathacks.com/explanations/ is my free stuff.
I pointed out that I couldn't do that without intellectual property, as someone else with a larger platform could give away my material for free.
Does that book you linked to address this point?
Crowdfunding is still a business model with a lot of room for growth, whereas cable and movies have saturated the market, at least in the USA.
It's even more beneficial to the consumer than something like Kickstarter, since they get to see the finished product before deciding whether to kick in funding.