5G LIMITATIONS AND PAIN POINTSDespite widespread hyperbole and consumer marketing, a full 5G rollout isn't likely in 2020. There are many immediate technology challenges to fulfilling the promise of ubiquitous 5G services (spectrum availability; the development of radio, switching and virtualization standards; government regulations; and real estate acquisition for the many small cell sites needed for broad coverage). We also must consider the need for backward compatibility to 4G radios and