I explicitly mentioned income per person. This is household income, which obviously will be higher than individual income.
And as far as connection pooling goes, India already has 88% 4G and 80% 5G coverage in the villages. Far cheaper connections are already available that are already being leveraged in a way that you describe. The market where Starlink is appealing is much smaller.
Lack of sufficient population density and political instability is what would stop this.