I think even a small amount of accountability would definitely start some much-needed conversations at software companies about things like "do we really need to retrofit this thing onto that working thing?" and "do we fully understand our dependencies and the consequence of merging from them?" and software quality would be better for it. If the consequence of a bug is low, go for it--the accountability should be low, too.

EDIT, just to add another example. I remember when I felt rushed and checked in some client code that did not implement exponential backoff for request failures--it just retried. Of course that code made it to production and our customers started DDOSing our server when a brief outage happened. I felt terrible about it and honestly believe I should have been fired for it. Yes, management rushed me, but they're not the ones that wrote the code. They're not the ones that made an amateur-hour error. It was me.