Apparently, hotpatching never really took off:
<a href="http:&#x2F;&#x2F;www.itwalkthru.com&#x2F;2010&#x2F;10&#x2F;hotpatching-great-idea-microsoft-but.html" rel="nofollow">http:&#x2F;&#x2F;www.itwalkthru.com&#x2F;2010&#x2F;10&#x2F;hotpatching-great-idea-mic...</a><p>Not sure if anything has changed in recent years, though.