Sundance was a bank-robbing outlaw, then a charismatic 1960s movie antihero, then a resort, then a lab for tyro filmmakers and finally a film festival that redefined what film festivals could be. Eventually, with its fleets of black SUVs and its platoons of celebrities and deal-makers, it became too large for its hometown of Park City, Utah. This year’s jamboree, which began on Thursday and continues through Feb. 1, will be the festival’s last in this mountain redoubt, which for all its snowy charms, with the Rocky Mountains framing the city, lacked the hotels and infrastructure for a major international conclave. “Think you used enough dynamite there, Butch?” one desperado asked his colleague in 1969’s “Butch Cassidy and the Sundance Kid” after an attempt to explode a safe destroyed a train instead. Sundance was meant to open up this town but wound up blowing it up.