The problem with Early Access, in my opinion, is that many of these guys have no idea how to manage their resources to ensure it lasts and many of them are hobby developers trying to develop a game in their spare time. This system should really only be open to people doing this full-time, not hobby developers.
I've been buying early access games back when they were exclusive to Desura's Alpha Funding section and out of dozens I've bought on there as well as Steam Early Access, only about 3 or 4 have either been finished or are making acceptable progress. The rest I've written off and will look at again in a few years' time, but I'm not holding thumbs that even 10% of them will ever be finished.
I think the Early Access thing is going to blow up in Steam's face this year as millions of people realise that games they've funded have made very little or almost no progress since last year.