It is a great idea. It has been noticed that the coffee cups have a plastic lining that makes recycling difficult. So the cup you have designed should be completely recyclable to avoid landing up in the rubbish bins. All the best for your idea to become successful.
Totally agree Aditi, governments across the globe need to provide incentives to the companies so that they can adopt more innovative measures of packaging that are good for the environment and also sustainable economically for the companies.