Do you really not understand how fundamentally anti-open-access Elsevier is? Have you not seen what happens to the other companies they absorb? Many of us have experience in this particular field and it's not a pleasant one.
Your official blog post is inane marketing-speak that has no basis in the reality of the damage Elsevier has done and continues to do to the fabric of science publishing. Mendeley should be ashamed, and you personally should be ashamed for perpetuating this nonsense. Within a year your company will be effectively dismantled and anyone left over who actually cares about open access can start over from scratch. I wish them luck.
I know exactly how bad Elsevier has been and I've spent most of my career with Mendeley campaigning against them. If anyone has the right to be mad about this, it would be me, but I've actually had the chance to speak with folks there, from the CEO on down, and I really believe they see something valuable in us.
There have been detailed discussions about how Mendeley can integrate with parts of Elsevier like Scopus and Science Direct. I don't think they would have gone through all that effort just to bury it. I could be wrong, but I think things are changing at Elsevier and I think bringing us in is part of that.
I'm sorry you have such sour feelings about Elsevier. I can't really comment much about that. However, I can speak for what I know from Mendeley and I can tell you that we have projects planned that span farther than the one year abyss you mention. We're excited and looking forward to maintaining our company culture, work ethic, and the ultimate goal of building a useful tool and resource that helps our users.