And if Fiji manage to keep England out of their try line and are accurate in their attacks and limit their unforced mistakes, they could conceivably challenge England, as they have the less dangerous back line of the big three.
This is pretty rough but;
Top 10 try scorers in the 2015 6Nations:
6 englishmen - 5 backs 1 forward (total of 16 tries)
3 welsh men - all backs (8 tries)
2 italians - both backs (2 tries)
1 Scotsman - Back (2 Tries)
1 Irish man - forward (2 Tries)
Top 10 Try Scorers in the 2014 6Nations:
3 Englishman - all backs (8 tries)
3 irishmen - all backs (8 Tries)
2 Welshmen - all backs (5 Tries)
2 Italians - both backs (4 Tries)
1 Scotsman - Back (2 Tries)
1 Frenchman - Back (3 tries)
by that reckoning the least dangerous backline has topped the top 10 tries scored by backs stats for the last two years.... with 22 (england) - 16(wales) - 8 (ireland)
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I don't believe Wales will lose to Fiji, but suggesting it could happen isn't about underrating Wales - it's based on a recent precedent of Wales going missing against Tier 2/3 sides who they are expected to beat. With regards to Fiji, each of the last 6 games have been exceptionally close aside from the 2011 RWC thrashing. There's a fairly similar story with Wales and Samoa, and obviously, there was the 2012 game..
This, it would be a big upset and i'd be very surprised if they lost, but they have a history of not showing up for these games - in both the WC and the AI's.