What made me think of this was first reading an article on Zonalmarking.net regarding about Spain continue to dominate possession but need more penetration.
Its about how Spain have struggled against big teams and problems they had against England. Ill sum it up as much as I can, Spains selection against England was a problem it had two wide players (Iniesta & Silva two wide players who like to come into the centre of the pitch) which floods centre pitch this will show you better

After a while Del Bosque changed tactics moved Silva to a false 9 role, Villa went to his usual role on left and Iniesta moved to the right but still have the same problems. Zonalmarking then suggest two alternate plans:
1st Creating width, using of Pedro or other natural wingers

2nd Fabregas (False "10" Role)

Now has Del Bosque in theory has 3 plans to go with.
The point Im trying to make is Barcelona & Spain are best teams in world but we all know that in football it will come to an end totaalvoetbal, Brazil 1970, Catenaccio were all amazing styles in football at some point but all came to end. Barcelona against Real Madrid recently, Guardiola changed his formation to 4-4-1-1ish 0ff-diamond to help gain control of the game and win.
Question is how important is a plan B or "Adaptability" in the modern game? Is necessary in FM (read the spoiler)
Spoiler