Typical idea of we have "inherent strength" type nonsense. Afghanistan,Pakistan, Bangladesh etc have little or no Hindus, your own Kashmir is pretty much gone if it were not for the Indian army keeping things in balance.
Hindusphere stretched from Afghanistan to Indonesia at one point. Now even parts of Interior India like western UP, Bengal,Kanyakumari , you have people struggling for existence. The only reason why even this much remaining is due to people who kept fighting.
In this day and age you do need organizations, lobby pressure groups are how things work,Hindu society is in it self controlled by the govt and Christian and muslim groups lobby hard to gain influence in such things. They are the kinds that get about incredible things like RTE, Communal violence law,Triple Talaq, asking for more quotas etc. An unorganized group will of course not have the strength to face up against such things.
Adapt or die out.