India is basically a long horse civilization and a self consuming economy. Therefore I would take these alarmist theories with a pinch of salt. Remember in 1998, the whole world refused to talk and trade with us after Pokhran 2. What happened to the majority of us? Nothing
Whether we accept or not, US/UK economies -- being largely consumer driven and open economy -- will have a huge impact on global economy health.
Yes, Global economy issues and US elections will impact global trade policies and markets. But this will be a generic impact on all countries.
What could impact India in a big way will be of our own making and not the Global economy or USA.
It will largely depend on Our own investment and social polciies , education policies, corporate programs, cictizens willingness to adapt and embrace change and choosing the correct global partnership.
The biggest problem affecting the investment climate and standard of living in our country is our increasing cost of doing business, our never ending increase in: inflation, wages,home prices, job attrition.