As Microsoft Dynamics RMS users start to think about plans for beyond July of 2021, more and more options are becoming available. While Retail Management Hero is the least expensive and least stressful migration option for most RMS users (pending the release of the RMS HQ replacement for Retail Management Hero come the end of 2017 which should scale up nicely for RMS users with multiple locations and will not be cloud based as previously reported), Microsoft Dynamics 365 has some retail/point of sale functionality that might appeal to retail chains who want a cloud based solution to save on hardware expenses.
Dynamics 365 allows for the modular based approach like Dynamics AX does and features a very robust enterprise level solution that would appeal to retailers with multiple locations and/or complex operations.
A single user license cost for Dynamics 365 - including the retail module - is $12,600 over the course of 5 years so retailers really need to balance costs/needs against other solutions. It basically boils down to factoring all costs associated with a POS system over the course of 5 to 7 years (hardware, software, network, deployment, support, updates, network, etc) against what your organization needs in a POS system.
More information on Microsoft Dynamics 365 for Retail can be found at https://explore.dynamics.com/operations-retail or please contact me at firstname.lastname@example.org or 208-340-5632.