I was working on an education idea a few years back in university, something very similar to YC's Lingt. After reading up on the market, I came to the conclusion that education was a sales-driven business, not a product-driven one - ie you can't beat Blackboard with a better product, because they have an army of salespeople and you don't. However, I do think you could "consumerise" edutech products where you sell directly to consumers, and where consumers are willing to pay a lot, like in language learning or professional qualifications. (Which suggests I should have stuck with the Lingt idea, but whatever).