Photonics touches our daily lives from our cell phones, TVs, illumination to optical communications. As applications and user requirement become more complex, there is a need for integration. The question remains what is the principle driver. Within each market segment there are different requirements in terms of speed, power, efficacy, size and cost. Is the mass production the key driver for increasing the functionality on a photonic chip, or is it the cost, or the application itself. In this panel session we will discuss the challenges faced in different market segments and whether there remain advantages in hybrid and discrete packaging or whether photonic integration is inevitable.