Coaches will come and go..
But i think the biggest fallout will be, or should be that the 'Pool of Death' never happens again. It's fine for us Aussie fans to be lauding the demise of England, but it's not healthy for the competition. The Quarter Finals should feature the 8 strongest teams in the world, yet the way this RWC has panned out i don't think that will be the case.
Like FIFA, World Rugby should decide the pools closer to the tournament which sees an even division of the strongest teams. Its unfortunate that a team like Fiji, who could have in reality reach the QF had they been in another pool had to face 3 of the top ranked teams in the world.
It's very healthy for the competition and whilst England going out in the group stages is bad for ITV in the short term, the very difficult group provided an early surge in ratings.
If anything it gives credence to the competition and World Rugby's aims. People often criticise rugby for having a limited number of nations involved and a limited number of nations who have made the knockouts. Here we have a host nation and previous champion and three times finalist out of the competition early on based on performance. The draw was as a result of performances of others. Wales lost to Argentina and Samoa at home so the draw was earned. The pre tournament competition is now working and is delivering a cycle where international games are not just "Test" matches.
Likewise in Japan's pool we have the 4th seed beating the 1st and 2nd seeds in their group. If Japan qualify they will be the 13th nation to qualify for the quarter finals. This is very exciting for rugby and speaks of increasing competitiveness.
We are always going to have "pools of death" from now on- we've had them since 2003 in reality. Argentina in hindsight had a strong side in 2003 and were just pipped by Ireland. There were several close games in that group. In 07 again Ireland and Argentina were in the same group along with France, 2 of the sides from that group ended up in the semi finals.
World Rugby will be hoping for another major milestone to happen (alongside Japan's upset win and England crashing out); Japan qualify for the QFinals for the first time, Ireland make the semi finals (first time) or one nation who haven't made the final get there (Ireland, Wales, Argentina having a small chance each).
The more competitive the tournament and the greater perception of competitiveness there is of it the better. Just look at what rugby league have had to do with their group stages to avoid batterings and to get a couple of early competitive matches (which are largely irrelevant anyway given the way you qualify for groups). The IRB/WR (World Rugby) have done very well to get a competitive competition out there given the minnows aren't spared their blushes against the big guns and the transition to professionalism