Yes, but you're talking about a fully embeddable browser engine that doesn't exist yet. I want to see it come to fruition, too, to be clear.
Wouldn't it be easier to fork Gecko and use that? Or Blink/WebKit? And some already exist (LibreWolf, Brave), so if those aren't satisfactory replacements then I can't see Servo being a silver bullet.
To be clear, I love the idea of Servo and I think the browser ecosystem needs to not be an oligopoly. I just don't think it's a silver bullet. I do think it can be a step towards an open future of the web and I am fully on board.