I'd expect at least one more really competitive round before fatigue starts to sets in (really hope not, would be great for it to continue throughout the pool stages) but nonetheless a definite clear jump forward by most. Namibia really impressed me against Fiji, Japan wasn't much of a shock actually as they really pushed the Italians pre-RWC (maybe a 6 Nations in 2016?), the US has seen a 200% increase in professional contracts since 2007, all they need really is a 5/8 to provide the guidance for their backs which actually aren't too bad. There's a lot of positives to talk about. I expect Georgia and Canada to do rather well to.
What's also very encouraging is that there are a couple of team particularly in Europe that would also be competitive (in Romania's case more so) that didn't qualify. Both Portugal and Spain beat the same Romanian squad by more than Scotland did just this year in the ENC 1A. So the IRB are definitely doing a good job there.
This leaves a question though. How do they accelerate this? Personally, alongside current funding objectives maybe a push toward establishing more professional 'leagues' to help boost the standards further. Countries like Germany, Belgium and the Netherlands have formed a Super Rugby-esque style tournament with 4 clubs from each nations called the Euro Cup looking to boost their standards, the IRB should be looking to support these.