This is a confusing attitude to me. It seems to be akin to saying "standard lenses are old hat, we should be learning how to work with ultra wides and shoot differently"
Who cares whether a certain approach, technique, technology is old or new. I presume that most people who take up photography professionally, or as a serious hobby, want to make good photos, not restrict themselves to shooting family snapshots or holiday snaps (not to suggest that these activities aren't an important part of photography, they're are probably the most important, certainly the most common). If so, we should take advantage of anything that makes this possible or easier. Whether that be a lens, an accessory, lighting, post processing software, a technique, a style or whatever, we should be embracing the full range of possibilities.
B&W and colour photography are not competing, they are different. It doesn't matter whether colour makes a photo or absence of colour makes it, getting the result you want is the goal.
Today I received Michael Kenna's book Trees. A beautiful book full of beautiful photography. It even (bizarrely) smells good. The pictures in it are B&W; they may lack colour but they don't lack quality. It's the quality that results from the effective use of photographic characteristics that is important, not the particular characteristics employed. There are plenty of boring B&W photos and plenty more boring colour photos. They are not boring because they were shot in B&W or colour, they are boring because they are not good B&W or colour pictures.
One photographer I like a lot, the Scottish landscape photographer Bruce Percy, shoots exclusively in colour (film) but I always think that his pictures look like B&W in colour. Bruce knows how to minimise the colour palette and make use of the abstraction of line, form, tone often associated with B&W photography.
Examples here: brucepercy.co.uk/21-18#/fjallabak-2019/ It's colour, but it's so minimally colour, it's also almost B&W.
Another photographer I like, Spanish-American photographer Adrian Vila shoots exclusively in B&W digital but when I look at his pictures, I see a similar minimalist approach and simplicity of composition and tones that I see in Percy's work.
aows.co/archive/spain/galicia/a-coruna Paint Adian's work with Bruce's colour palette and they'd be brothers in arms.
Again, it is never the medium or the technique that matters, it is how those things are used by the photographer.