I like how G+ wants a link on the homepage to verify ownership of a site. Is this not a link scheme? lol Yes, the alternative is to use a meta tag, but on some CMS you have to code a conditional for the homepage.
I think all these social networks hope businesses will dump their own website and produce content on their platforms so they can further monetize our work.
Back to topic, I don't think people are avoiding G+ or some flaw is causing it to not win over the big brands. Managing and producing quality content takes a great deal of work. Updating Twitter, Facebook, G+, etc. all takes time and money. Businesses want to see some sort of return for maintaining these profiles, and many can't justify the expense. If it were not for the SEOs pushing social, I think many businesses would greatly reduce spending on updates and instead spend that money on advertising.