Very unlikely

We have entered into a long term maintenance contract with a globally reputed IT company to ensure its long term existence and functionality

Even otherwise:

Every TROT transaction will be evidenced by a TROT Transaction Confirmation Note

It will be conclusive evidence of the transaction and will be binding on the developer and all the parties concerned

You are advised to save every TROT Transaction or take its print-out and preserve it

The developers will be under contractual obligation to honor their obligations even in absence of TROT e-Trade Platform
TROT Transaction Note shall be accepted as conclusive evidence by the developer

However, it may affect you as to its tradability and payment gateway functioning would be curtailed