Scalability is always great, but so far only Bitcoin and Ethereum have historically reached the limits of their blockchains, while other projects have 99.9% of their capacity unused. So, the question is, if all blockchains were suddenly to become scalable, would this solve the lack of user activity? I don't think so, there are tons of other problems, and most importantly, general population is just uninterested in blockchain.
What is worse is that even tech savvy guys, scientists, economists and others who seemingly should be interested in blockchain technology are mostly not interested in it. It looks like they have no time for examining the subject even a bit, because if they would do that they would see that it's not just another financial pyramid, but rather something without which future world is hard to imagine. I think we still lack a simple yet powerful explanation of what blockchain technology is, because we would have all those guys on our side otherwise.