I would say we are slowly getting there. You have to realize this is a long term project.
Some people are working very hard to make Solarcoin a success. In reality I don't think SLR has incentivized a lot of people to put Solar Panels on their roof. Simply because it wasnt really worth the hassle. Just like mining bitcoins wasn't really worth it back in 2010. people only started to really understand it when the price started going nuts. I think now that people are actually paying a lot more for solarcoins the incentive for claims will rise just like it did with mining for bitcoin.

What I really like most about Solarcoin is that it's the perfect way to effectively invest in both blockchain technology and Solar energy. It's a new idea and like most new ideas it will take time to establish itself. It's definitely the most interesting crypto project out there. But that's just my opinion. Don't take my word for it


edit: I just saw the quote was from the Solarcoin foundation. I'm not part of the Solarcoin foundation, I'm just a speculator who has been following Solarcoin for a while