From the hypergrowth of 2015 to a reality check a year later, India's entrepreneurs and investors figured ­out the hard way that what goes up must indeed come down. Madhur Singhal, a partner with Bain & Company, says that 2017 will see tempering of valuations for series A, and an increase in the B2B startup sector, with themes that will dominate include AI, hardware, SAS and logistics.