nope, the best type of evangelism is evangelism. adoption by most heavily used sites jsut proves technical feasibility.
Unless the devs of "most heavily used sites" evangelize, it makes no matter which sites use svelte. As a matter of fact, Vue's adoption increased after Taylor Otlwell (Laravel's creator) and other started _telling_ people that they are planning to use Vue, instead of react.
IMO, to drive adoption rates, you would need dev evangelists
While the RFC states that they are taking cautious route here.
They also mention that they are not making an SPA which all the cool kids look up to.