At what point should we change our squad players though? If we win again everything, I feel like our team might not be as hungry anymore and we should replace some of them.. Winning everything two years in a row would be crazy and probably bad for some players motivation.
I don't buy into that - Elite-players will always be motivated to win more trophies. Most of our players have won so much in recent years, that they shouldn't be motivated right now if it was about winning everything once.
But I know what you mean - the problem in my view just isn't that overwhelming, when our best players are big-game players who enjoy the most decisive games the most (Messi, Neymar, Iniesta, Pique etc. - all play better in big games). Adding to that - you wouldn't think the team would have motivation to win 4-0 or 5-0 instead of 2-0 or 3-0, but you see everybody pushing forward even in games where the win is secured.
Of course we should make sure that it is
possible to change for example Alba if he doesn't seem motivated in easier games - like it is possible with Alves because of Roberto/Vidal this season. I would only worry for the easy games, and strengthen our "B-team" so topmotivated subs can do the job, if some of our starting-11 is unfocused.