The Motorola POL is more than just a fiber backbone, it uses fiber to provide a point to multi-point to provide an passive workgroup switch environment. It works by having a fiber aggregation switch that replaces the distribution switch, and connect to Optical Network Terminals at the desktop. You replace your IDF with passive fiber switches (1 x 32) that don't need power or cooling so it frees up your IDFs. It uses single mode fiber for the internal wiring instead of copper, so it has a longer lifetime than copper. To go from 1Gb to 10GB you will need to replace your cable infrastructure, the single mode fiber is rated for over 25 Tb and will not need to be replaced for a number of bandwidth upgrades.
The POL is a layer 2 access solution, and does not take the place of the core. It has inherent QoS as well as being designed to distribute Voice, Data, and Video over a common cable infrastructure (single-mode fiber) so it decreases the weight of the cabling infrastructure greatly. It is also a green technology since it rids the need for HVAC and Power in multiple IDFs since the signle mode fiber is split passivly, and it can run 20 Km as apposed to 100 M for copper.
