JPR Williams stopped a certain try and kept the Grand Slam alive for Wales.
Even if New Zealand win today, England have only won twice in New Zealand so they'll have every incentive to come away wit something the following week. New Zealand are unbeaten at home since 2009, so I shouldn't think any All Blacks want to break that run. The series could end today, but there'll still be something at stake.
You don't seem to know that the England XV which faced the Baa Bas had none of the players featuring in the Aviva final.