This gen has been alot more successful on the digital front than last gen so expect year on year sales falling with big MP type games. Without accurate numbers from downloads we can't say the Genre is falling. Most of those games above probably have 1m+ more on the digital side alone.
Sales nunbers are also alot harder to track. Many last gen titles could have been bundled alot more compared to this gen which leads to misleading sales comparisons aswell. Id say if a franchise is selling over 5m both Pshyical and digital id say its healthy. Weather its in decline is debatable because more sales doesnt always lead to more successful. Depends how its sold, what it sold, the profit of the game is a better indicater than "this game sold 8m and this game sold 4m" because that game that sold 4m might be real customers and made more profit where as a game that sold 8m could have been give aways, bundles, discounted etc.