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There's not a simple way to increase that limitation. This is part of the DDS/RTPS specification that we're building on top of.
In ROS2 we also have the concept of namespaces just like in ROS1 which allows you to push down resources (nodes, topics, services, etc) into a namespace to avoid naming collisions.
There's another DDS concept of Partitions that we experimented with using in conjunction with the impelementation of ROS 2 namespaces. However that was rolled back as it's not universally supported, and had some conceptual differences from the namespace approach.
I think that this might be a bit of an X-Y problem I'd suggest asking a higher level question where there might be a different approach to solving your underlying problem.
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