It is not up to me to decide that 
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Said that, my answer would be: “the last LTS created and supported by OpenRobotics aaaaand I don’t see who else has the capacity, time, desire, interest and money to continue the support ROS1 once a better alternative, i.e. ROS2, will be eventually available”.
Let’s not forget, by the way, that EOL of Melodic is 2023. Let’s be ambitious! 
Many of us don’t see in ROS2 a valid alternative yet, but I want to believe that this can change.
By valid alternative, I mean that the return of investment of switching from ROS1 to ROS2 is either bad or uncertain.