We have been in discussion with the necessary resources and have been able to verify that when a product goes out of extended support, there is nothing that prevents the user from activating the product after it is no longer in extended support.
As there is nothing in place to shut off the ability to activate, you should be able to activate the product after July 13, 2021 the same way you are activating the product today.
We will also be confirming this after July 13, 2021 to be sure.
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For anyone who is not already aware, Mainstream support for Microsoft Dynamics RMS 2.0 ended on July 10, 2016; and extended support ends on 7/13/2021:
community.dynamics.com/.../microsoft-dynamics-rms-2-0-mainstream-support-discontinuation-july-10-2016
support.microsoft.com/.../search

This is less than 2 months from now; and you can continue using RMS after this date but technical support will not be available.
I would recommend checking with your partner in regard to what they may recommend as a replacement system after the extended support end date.