Since the beginning of the 2011RWC, the All Blacks have lost 3 matches out of 54 matches played, so in a sense, they peaked in 2011 and have maintained that peak ever since. If they lose a match and exit the RWC, they won't have failed off their peak because I expect business as usual next year.
BTW I am still not happy about the Half-a-Rugby Championship travesty we had this year. First up, they should not have arranged the Samoa match this year. Those sorts of matches need to be reserved for non RWC years.
There was no reason why a full championship could not have been played, complete with a break week in the middle.
ROUND 1: 11-12 July
NZL v ARG in Christchurch
AUS v SAF in Brisbane
ROUND 2: 18-19 July
ARG v AUS in Mendoza
SAF v NZL in Johannesburg
ROUND 3: 25-26 July
AUS v NZL in Sydney
SAF v ARG in Durban
***** BREAK *****
ROUND 4: 08-09 August
NZL v AUS in Auckland
ARG v SAF in Buenos Aries
ROUND 5: 16-15 August
NZL v SAF in Dunedin
AUS v ARG in Melbourne
ROUND 6: 22-23 August
ARG v NZL in Buenos Aires
SAF v AUS in Cape Town
Note that NH teams were already playing RWC warm up matches in the first week of the RC, and they were still paying them this weekend just gone; the weekend after my proposed last round of the RC.
I've had enough of our SH test programmes being short changed in RWC year.