Hopefully they recognise their niche and stick to it. I'm particularly interested in Svelte for compiling down to vanilla WebComponents to be used in P2P apps (eg Holochain) where you want the end users to be able to modify components themselves.
Sorry, but seems Rich is not too happy with WC', if you want to do use a compiler to vanilla WC's I think stenciljs might be your best option. LitElement is also good - but it is not a compiler. Svelte V3 doesn't even have custom element section documented at all at the time of the writing.
