Well this is the guy who makes Far Cry 4 and he worked on FC3 as well... so I would say this is the best Ubi has to offer!
Now, will one type of game make the other type suffer?
I think we will have to see how bloodborne or Uncharted 4, maybe even the Order, Thomb Raider XB1 and Quantum Break do next year... I think the "linear" games are doing pretty well these days!
As good as Watch_Dogs? no... but Destiny is not open world and it did better...
So what to make of this? ... well this is another Ubi talking head that speak non sense.