The simplest way to achieve a no-tipping hotel is for all guests to refuse to tip.

After decades of declining tips, most European hotels' staff do not expect tips for routine functions. The same will happen over time in the US.

I maintain that all US residents or visitors should feel an obligation to tip the sub-minimum-wage staff because of this quirk in the US employment laws. Those lower wages apply only to waiters and bartenders as employees. (Self-employed or commissioned people are not employees and are not part of this unusual low-wage exception).

Maybe someday this will change. If so, tipping would probably disappear here in the US outside of the unusual "above-and-beyond" cases that have been discussed above.

In the meanwhile, please, do not try to expand the tipping practice any further. At the very least it is confusing to our guests; at worse, it lessens the value of work performed by the worker for his employer: a bedrock of the concept of labor.