Aurora,
you probably just have answered your own question. There *should be* C3, then C4 etc. A company should leave itself room to release new products. C3 will become priced lower but still exist, and with a new model introduced the total revenue will be bigger than if having just one model.
Tools do not need to be "cool", people buy tools because they want to use them on the job. Imagine a construction guy dancing around at a construction site with his smartphone and Flir One, with its flimsy lightning connector being the only support to the camera.