I think the idea of "team DA" vs. "team Witcher" makes much sense. At least not to me. I am glad that both series exist and I play them both.
I may think that the Witcher may be slightly ahead but that is mostly because I like their combat system more (and that is a matter of taste) and because of CD Project RED's awesome business model, which is quite unique in the industry's AAA sector. In terms of story telling, characters and world building, I think both series do a fantastic job. Both also have flaws but in general, I don't think one will overshadow the other any time soon. Also, these series are not like Assassins Creed or CoD where we see a new iteration at the same time every year. They do give each other enough room to coexist.
I do hope that W3 will be the best in the series yet and from what it looks like I am optimistic. Will it be better than DA:I? I think there is a good chance that it will (IMO of course) but that would be great. We do want to see evolution in games, not devolution, right?