By Poornima Gupta and Noel Randewich SAN FRANCISCO, Jan 28 (Reuters) - Apple Inc's shareholders have been hit by one of the bloodiest weeks in the history of the stock, but wider fallout from such weakness might be more important to the long-term value of their investments. While Apple's iPhones, iPads and Macs remain gold standards, signs the company is losing some of its edge in the smartphone market suggest its clout with business partners could wane. Recent comments from execu