Do what you like. It is just hardware and if you get bored of it, or it becomes "dated", you can change it out in a few years.

Brass in and of itself isn’t dated. Right now, people seem to be leaning towards unlaquered brass, but it’s still brass. I think people associate brass with certain shapes and items that were popular years ago, and they are lumping the material in with the shape.

If it's not dated now it will be shortly. It certainly has been in the not too distant past. There's a multi-billion dollar industry whose lifeblood is ensuring that whatever you have now will be "outdated" and need to be replaced within the decade. Just say no to this incredibly wasteful treadmill, and put in whatever you like and want to live with. You don't need to live according to other people's tastes.

As others are saying - install what you like. Trends come and go. So, yes, brass will fall out of favor and then be in favor again some time again.

On the other hand, I lived in a building that has had brass hardware since it was new in 1830. Brass for all hardware except bathrooms has pretty much been the default in America since hardware production moved out of the blacksmith's shop. It will never be totally incorrect.

Just like chrome will never be inappropriate for a bathroom. That hardware was brass first, but it turned black, then they plated in nickel which required some upkeep and then they got to chrome which is maintenance free.

So you may not be at the height of fashion with brass hardware and chrome in the bathroom, but nobody is going to look at that and say "2015" like they are with matte black hard edged door hardware.