Well Chelsea, Juventus and back then Inter used to win alot of cups with defensive football. Btw, i differ between defensive approach and counterattacking football. A counterattacking football can be very exciting and fast aslong as you are really willing to contribute to the game and make it an exciting event. Mönchengladbach in the 70s used to play a very strict and complete counterattacking football but hell they were fast and furious! You loved to watch them play and destroy so many good teams not ony on national but also on international stages. They were - unlike alot of successfull yet boring and unexciting italian teams- not a defensive team but a team that played a perfect and fast counterattacking football on purpose.
The thing is, this Barca style is not born over night to be immitated by others just like that. For over a decade they have taught even the youngest of their youth footballers more or less the same kind of football their pro teams play since Cruyff. They even select and recruit their youth players based on the skill sets they need later on their pro teams. They have developed a very unique and wonderfull kind of sportive hegemony inwhich their goals and even the way those goals should be achieved are very defined. This is why the basically dont need -and dont want- a coach to come and overhaul the whole system by implying his own will on the whole organization. They bring in coaches who are willing to go the Barca way and not the other way around. This is their terrain, this is their game and they are successfull because this system is an integral part of the whole organization. The other teams do rely on a single coach who comes and like to play this system so they try it a little bit and once the coach leaves the club, another one comes in and has a completely different view of football and how it should be played and they let them do. So most other teams bascially do have to rebuild again and again while Barca are just reloading as the fundaments seem to be untouchable.