Microsoft was doing that with their consumer software for a while. The biggest issue is that people think the software is out of date as soon as the next year comes along.
With an actively developed and rapidly changing piece of free software, version 2012 actually would be outdated (and possibly insecure) by mid-2013. If the perception of outdatedness causes more users to upgrade in a timely fashion, I think it might be a good thing. Especially since you don't need to pay anybody $300+ for the new version.
Having said that, LibreOffice seriously needs a more seamless update experience for consumers. Re-downloading a 100MB installer and re-installing every time a minor update is published gets tired rather quickly.
Having said that, LibreOffice seriously needs a more seamless update experience for consumers. Re-downloading a 100MB installer and re-installing every time a minor update is published gets tired rather quickly.