So far, people elsewhere on the forums have identified several reasons while the India Crush will not be a valid strategy in Global (which is not to say that taking India won't be an important goal, just that the headlong charge we're seeing now won't work as well). Chief among those reasons are:
1) The UK will be able to support India with units from Africa/Middle East and production from the South Africa Complex.
2) The USSR can threaten northern Japanese territories (and also possibly shuttle some infantry directly down to India.
To these, let us add one more.
3) The India troops will have room to maneuver. In AAP40, the UK troops have their backs to the wall (or the edge of the world, as it were). In global, they'll be able to step back to West India (not to be confused with the West Indies
). The Japanese assault in the first few turns is a glass cannon--only a few land units with massive air power, lending them huge offensive capability, but little capacity to hold a territory. By the time Japan is knocking on India's doorstep, their income will be reduced to 4, so losing that income isn't that big a deal. If Japan goes full up India Crush in the first four turns, the UK can (even without extra units from Africa or support from the USSR) buy one or maybe two turns by retreating out of India and retaking it on their turn. These extra few turns should make the difference in letting the Allied production catch up with them.