Yes and no. If we purely speculate based on cost of offering, it is not any more expensive than providing a 1Mb connection over the same infra.
If we ignore the routing power required on the customer side (assuming, they will bear that cost or it's 100% BYOD). The infrastructure is already there ready to push, the only provider that will fall behind are those that are completely reliant on T1 ISPs of India for transit. (For domestic, as a very good chunk of India's usage stays in India thanks to localization and increased push of PoP based DCs)
Even in that case, ISPs prefer to buy based on what is called the 95th percentile. So, unless everyone will Rev up their 1G at max all the time, that hopefully should not be an issue.