We investigate the formation and dynamics of spatially broad Dirac light bullets in nonlinear binary waveguide arrays. We show that a Dirac light bullet can be formed during propagation when a pulse with an initial profile slightly different from the one of the Dirac light bullet is launched into the system. We also reveal that these Dirac light bullets are metastable and can propagate without significant distortion for hundreds of dispersion lengths even in the presence of the Raman effect, group velocity mismatch, and group velocity dispersion difference between adjacent waveguides.