He died in Argos, not at Sparta . . .
But had he not been brained by the roof tile? I dunno, the guy had a propensity for being mercurial. Just about any guess is good as the next. His recognition of the potential power of the Romans should be noted, though. Assuming that he'd focus on stabilizing and unifying Greece and Macedon, maybe he'd try to retake Magna Graecia.