Tesla just replaced its $80,000 flagship SUV with a stretched Model Y, and the math says it's the smartest product call they've made in years.The Model X and Model S are gone from the US lineup. Killing your halo cars looks like retreat.Run the numbers instead. Three-row family SUVs are the largest vehicle segment in America. Highlander, Telluride, and Pilot move hundreds of thousands of units a year in the $45-60K band. Tesla had nothing real there: the Model X started above $80K, and the old 7