It is likely that Nintendo can pull another victory but there is no way of knowing before we know exactly what all three (and a potential fourth) have to offer. This gen is a lot closer than the previous two and in that regard the market is a little more balanced between the three competitors and that leads me to believe that there won't be a devastating win next generation either (one could argue that this gen will be a devastating win but not compared to last gen).
But, yes, like I said initially, I do think Nintendo will come out on top again all though possibly by a smaller margin this time.