I think security tokens will be large but I think social media tokens will be the next big thing in crypto, much bigger than Security tokens. We only have a small taste of social media tokens so far in Steem but with the launching of EOS with a very high transaction time, and no transaction fee I predict that the new decentralised facebook and twitter is just around the corner. Facebook along has 2.19 billion users if they can all of a sudden start getting paid crypto for their daily facebook use they will leave facebook and go to the new replacement of fb. This will cause a mass adoption of cypto and will be the biggest thing ever to happen in the crypto world.