I've got amigos here up Madrid way that opened a pizzaria a year or two ago. Brought in a woodburning oven from Modena, Italy and produce delicious flat napoleatano style pizza.
Small place, like.. 8 tables + terrace, in a sort of out of the way location. But, they're having to take reservations on weekends in order to control the 'crowds' ('crowds' being a relative term).
So, pizzarias can be successful. In this case they succeeded based on quality, not quantity.