Certainly the driver behind this it cost savings that just happens to align with environmental PR. Same was true when they tried to get guests to reuse towels.

Soap dispensers on the wall give it a feel like a public restroom which is not great for high end properties. If I’m staying at an aloft that is already the case, and understandable but I can’t see top properties doing that. I noticed the St Regis bottles are bigger even now so maybe they will stay. The bottles also help to market and sell the better products - I remember taking the leftover bliss from a W hotel and then we liked it enough to order it online.

if they do this for the lower end properties like courtyard, Fairfield, etc. then that would be the majority of the cost and environment savings. If people are paying north of $500 for a room, they probably don’t want a common use dispenser or bottle.