Colours and styles might 'go out', but if the people who paid £££ to have them installed liked them when they were 'in', then what does it matter? The whole cycle of 'in' and 'out', whether it is colours, size of tiles, style of handles, materials for floors or whatever is a giant Marketing trick.
People buy what is available when they want it. For a while the fashion was for grey interiors, and it was difficult to find much in other colours, and most of those would be considered to have 'gone out' anyway. Unless people want to add to landfill by throwing things out every five years and getting the next transient 'in thing', they live with the things they loved and were 'in' when they bought them. The things themselves haven't changed, just the minds of the people selling more 'stuff', so why would the owners have gone off them?
And no, as it happens, I have no grey in my house, but not because someone else has decided that it's had its day. I'm getting a new bathroom fitted in a couple of weeks, and it will have to last until I go to a home for the bewildered or leave feet first. It is costing a fortune, and I know that in five years time there will be people saying that everything in it has 'gone out' and sneering at it, but what's the alternative? I can only choose from what's available, same as everyone else.