#1 It would be great for La Masia and in turn, Spain
It might be a simplistic view of things, but the last two World Cup winners have been from countries whose top club had been managed by Guardiola. England isn't about to win the World Cup anytime soon, of course, but the footballing culture Guardiola brings along should not be understated. Raheem Sterling is a fine example of a young player who has been rejuvenated after seeming like fading away under his previous manager.
Succumbing to the pressure exerted by their fierce rivals Real and bowing down to the short-termism of modern football, it is sad to see that Barcelona rely far less on La Masia today than they used to.
Under Guardiola, they created history in November 2012 when they fielded an entirely homegrown eleven at Levante for more than 75 minutes. Those days seem far off now – so does Spain's stranglehold over world football. Guardiola's return to Spain might be the shot-in-the-arm that La Masia, and in turn Spain, desperately needs.