@Paul8503 Interesting premise. I think it would be very unpopular with hosts, though. If reviews were weighted this way, it would be impossible for your ratings to recover from a long-term stay that didn't end perfectly (e.g. a damage claim). Let's be honest here, people always want a thumb on the scale when it benefits them and cry injustice the minute it doesn't.
As a guest, if I were booking somewhere for 1 night, I'd find the short-stay reviews more relevant than those from long-term tenants. It would be nice to be able to customize the ordering of reviews the way some other sites do (Google, Amazon, etc). This would also be unpopular with hosts, though, as one feature would inevitably be displaying the lowest ones first.