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Well, what should work is the following:

• have your robot.launch as it is

• a robot_ns.launch with the following in it:

  <arg name="my_ns"/>
  <group ns="$(arg my_ns)">
      <include file="$(find mypack)/launch/robot.launch">
          <arg name="namespace" value="$(arg my_ns)" /> 
      </include>
  </group>
  

• and then, in the top-level launch file, do the following:

  <include file="$(find mypack)/launch/robot_ns.launch">
      <arg name="my_ns" value="r1" /> 
  </include>
  
  <include file="$(find mypack)/launch/robot_ns.launch">
      <arg name="my_ns" value="r2" /> 
  </include>
  

You then don't reassign arguments (which you actually cannot) and you only have to write the namespaces out once.

I guess you could also have this in just one launch file, if your robot.launch could handle an empty namespace argument with the group tags correctly.