It is hard to maintain the motivation and focus of your players year after year when you are a club in Spurs' position.
At a midtable club, nobody has any illusions about winning the league or doing exceptional things. Its just about getting the players to be professionals, have some pride, and also to play hard for their own career reasons.
At a club that is truly in contention for the title or has been recently, you can get the best effort out of players by appealing to their competitive instincts. Winning big trophies is what they've dreamed of all their lives. Now go get it!
But at a club like Spurs, it is hard. You can achieve very impressive things by convincing your players that they have a shot to be a title contender and realize their dreams as long as they commit themselves to the cause. And this is what Poch managed to do for a few years: I think he had his players truly believing that they could win the league and beat anyone if they played their kind of football. But when evidence starts to pile up that its just not going to happen, and when some of the leading players make it obvious to everybody else in the dressing room that they don't believe in this dream anymore and are looking to leave, its really hard to keep everybody giving 100% every match and maintaining focus. This is a problem that Arsenal fans obviously know well. How do you keep top players that want to be the best and win everything truly committed and focused when everybody knows they're not really title contenders and that its very very likely that the "top four trophy" is all they'll end up with at the end of the year?