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> it could be a concern for any spacecraft that can carry a payload into orbit.

No, it's only a concern for spacecraft with significant cross range capability, like Shuttle and X37B.

All other spacecraft have predictable trajectories, like ICBM's.

The upcoming generation of hypersonics are worse: they are significantly harder to detect on top of speed and maneuverability.

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Cross-range applies within the atmosphere, not in orbit. Once in orbit, spaceplanes have no less predictable orbits than anything else with fuel and restartable motors.

For the X-37 to deliver on a surprising vector it would have to sacrifice itself by deorbiting and manoeuvring, which I suppose is feasible. But modern MaRVs also have some re-entry cross-range and HGVs considerably more.

If you read TFA you'll see that the x-37b does have "cross-range" capabilities in orbit. It has enough fuel for some orbit changes, as reported in previous news, and in this instance it uses aerobraking to alter its orbit significantly at the cost of very little fuel.

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