Preston-Werner is an investor in Netlify, RedwoodJS was built with Netlify in mind (though it supports others hosting companies but not to the same extend).
Netlify is competing with Vercel that has Next.js. So basically RedwoodJS was built to sell more Netlify hosting plans the same way Next.js was for Vercel. It is therefore safe to say that RedwoodJS will continue to exist as long as Netlify is a thing... unless Next.js completely owns the market and RedwoodJS's reason to exist makes no sense because of too few users.
Netlify is competing with Vercel that has Next.js. So basically RedwoodJS was built to sell more Netlify hosting plans the same way Next.js was for Vercel. It is therefore safe to say that RedwoodJS will continue to exist as long as Netlify is a thing... unless Next.js completely owns the market and RedwoodJS's reason to exist makes no sense because of too few users.