ISL is well-marketed. Player development pipeline is broken. The two facts together explain India's ranking.
The Indian Super League runs the best-marketed football product in the country's history. Attendance, viewership, and franchise valuations are all up. The Indian national team's FIFA ranking is unchanged. The two facts coexist because ISL is a top-of-pyramid product without a real grassroots pyramid feeding it. The fix is structural and uncomfortable: youth academies in tier-2 cities, school-level competition leagues, and salary pathways for under-19 prospects. None of this is glamorous, and none of it is currently happening at meaningful scale. Until it does, ISL will keep growing as a product while Indian football as a sport plateaus.