>SMTS have the advantage to bring in large numbers. If adopted by a handful of websites that have 10M+ MAU

Focus on Steem Engine tokens prove this is even possible with a smaller website, no big website is going to adopt SMTs that fast man, first we need to develop the steem engine community to teach steemians how to create their own dapps front ends using SE tokens then maybe we can have the front ends for SMTs etc