The SQLite Consortium clearly has enough employees and importance that that's a fair estimate. You could talk to them about joining the consortium and see if y

The SQLite Consortium clearly has enough employees and importance that that's a fair estimate. You could talk to them about joining the consortium and see if you can manage to get a quote, then extrapolate from that, but really, the members are deep pocket types who are utterly dependent on SQLite3 and who want improvements (not just support).