I am pretty sure Germany is going to defend its title this year. The last games showed how competitive they still are; assuming they will play even better at the tournament since germans are best when there is something to win. 
Your opinion is very good. Germany is a great team with amazing players and maybe it will defend its title this year, As you said they always play even better when they are in a tournament. Germany is one of top 5 team, which I predict to win the world cup, I think we will watch a very good match in this world cup, I am excited too much for this tournament.