A single sportsperson can make a huge difference to a sport in a country. Like Gavaskar in India, Imran in Pakistan and Ranatunga in SL. Cricket in those respective countries saw a drastic rise in popularity due to them.
You did not refute the point that India was probably passionate for cricket before Gavaskar.
It's a matter of perception, including retrospect. I'm not saying someone can't be hero-worshipped or idolised or anything or that their success cannot give new life to something or new-found popularity—we see it all the time—, but that may obscure the groundwork: cricket was popular in India before Gavsakar, and more popular after, and he is
not exceptional in that regard. How did people get into cricket in India before, did they have their own heroes? Did it effect the tone of media coverage thereby inflating the sport's prominence in newspapers, etc. despite it already being incredibly popular to make it even more incredibly popular? You mentioned the national situation: did rising living standards play a part, and an ever so slightly wealthier population more able to partake in such activity latch onto someone who was round at the right time, but would have remained much more obscure if he'd debuted in 1949?
And so on, you will disagree with what I am saying, but it's the same sort of thing, and it behoves one to take a less wrapped-up view of things. Don't be like the Big Bash commentators.
Two other points:
First, to say that, 'In India, many people inspired, therefore
must make greatest' is a somewhat blinkered view, but this is what your argument collapses too. Did Bradman not count because Aus's population was much smaller than England's, ergo, cricket 'wasn't as popular'? Or the WI population is smaller again, so they don't count as much? Population may determine bums on seats, but greatness
as a sportsman to be ultimately measured in sporting terms, with other factors secondary. From an Aus perspective, I actually doubt he would have made that much of an impression on the Australian fans compared to the WI players. India saw its tours of Aus cut from 5 tests in 77/78 (its first since 67/68) to 3 in 80/81 and 85/86, only increasing again after his retirement: perhaps he damaged India's cause in Ind-Aus cricket and his retirement raised it again (absurd, I know, but the same sort of logic).
Also, for raising India's profile: New Zealand improved in the some period India did, what about that? Should Bevan Congdon and Geoff Howarth be put up several rungs in Circket's greats because New Zealand became a team that could win and draw (rather constantly lose series) under their watch?
As for the commercial side of the game, Kerry Packer was the first to actually turn cricket into a commercial package, what about him? Perhaps Ian Chappell should be the man who 'changed cricket itself' as he was the
player who did the most (IIRC) to spearhead the change and establish WSC, and everyone else is just followers or merely copying the latest trends in other sports to greater commercialisation and pay.