troof--
You are completely mistaken.
They did not beat France in London, they were slower by .19
Everybody knows that Canada soundly beat Japan, as well as France, in London, and that they finished just ahead of Trini.
In Beijing, they "beat" the USA not because they were faster, but because USA was DQ'd.
In Beijing, France was rebuilding and almost made it into the final, FROM LANE 1.
And there are other countries Japan will have to be worried about: Brazil, Nigeria, even maybe places like SKN, Bahamas, and Italy.
Every time I get to thinking about this, I think that I should start up a serious program in Nigeria.
Canada and France are only getting better, Trini is young and strong, SKN has been setting relay national records regularly without Collins, Brazil will want to build well for Rio 2016, etc. There are lots of teams that are improving noticeably--heck, even the Jamaicans and Americans have been improving, while the Japanese seem to have remained static.
Japan has only 1 Olympic medal in the relay, that bronze from Beijing, and that was largely due to the Americans being DQ'd.
Make no mistake, I think they are very solid, and quite excellent. They are always in the mix, and execute well, and I'm always cheering for them. I'm just not seeing any development potential, unless they seek some medical attention. Their strength is in their organization, their weakness in their top-end.
When you watch especially the anchors or 2nd legs, you realize where their weakness lies. They haven't been able to compete on that basis, and their best guy gets smoked by the best guys from other countries--the best they can hope for is that their organization throughout the race will be enough to offset inferior speed--but with so many countries coming on with guys who are really fast with good SE, the Japanese are likely to fade in the standings.