"Open Core" means they open-source the core of their product portfolio, core which some enterprising people may use to develop applications on, but for others will really need the buy into the rest of the portfolio to get the best use out of.
I think the fault is with the consumers. Many companies consume but do not participate in open source. All the incentives are there for companies to become vendors rather than participants (stewards?) of an open source project.
I may be mistaken here, but I think we will see pure functionality become less important to enterprise customers, which might (maybe not, but one can hope) proper open source business models more viable again.
In fact there's been quite a bit of vitriol about Canonical (company behind Ubuntu) profiting (for what that's worth) from all the hard work from Debian volunteers and not sharing as much of that value back to Debian as was felt was deserved.
* I do realise that different release timings can fudge with the timing, but when fedora is building upstream versions and I hear it, its a bit.. disheartening.
I think this usually doesn't really have to do with Canonical at all, but with third party developers only testing against and building for Ubuntu.