Zerodha can leave other discount brokers behind if
- If a robust 64bit desktop platform is offered (probably others cant afford it financially)
- Work out a way for CFD trading in foreign exchanges (cud be thro a company established overseas for traders or some other way)
- Repeat what it did already (discount pricing). i.e to offer facilities that are only available currently to institutions such direct market access to trader who go beyond certain number and value of trades. etc