And even now, after said theoretical vulnerabilities have been reified, there is very little cause to be concerned about the vulnerabilities under discussion unless you host code for other people as a business model (or use such a service). Otherwise your biggest concern is a web browser that already has a whole host of actual and theoretical vulnerabilities of its own.
> unless you host code for other people as a business model
Or is a victim of one of those javascript based exploits when visiting a random site.
This suggests a level of informed consent that I don't think existed. It implies that "the market" (who?) knew of, understood, and agreed to the risks.
And anyway, "the market" does a poor job of representing some of its stakeholders, notably the disorganized group known as users, and immediate competitive advantage may be the only metric driving decision-making.