'becoming less useful' is a correct and usable phrase in written English.
You can use it to express when something is declining and losing its usefulness, such as with technology or processes. For example: "Due to changes in the industry, the old methods of manufacturing are becoming less useful."
But it is becoming less useful as technological development creates new products that are not covered by it.
Police say they need the powers because the scale of activity carried out online meant traditional methods of surveillance and investigation were becoming less useful, but accepted the measures would need safeguards to protect privacy.
It's one of those weird things that Apple 's iPhone does extremely well but it also keeps the phone from becoming less useful, less appealing and less snappy as developers craft ever more applications for the gizmo.
Comparing Wisconsin and Nicaragua reveals that distinguishing between developed and developing countries is becoming less useful.
Mourdoukoutas's argument that libraries are becoming less useful is patently false, in a way that's fairly obvious.
Yet downsides to the network effect are emerging for social networks, which risk becoming less useful to users as the din of data from their millions of members increases.
But, Ford adds, it is increasingly obvious that we are becoming less and less useful compared to machines.
Prentice cites such groundbreaking interface devices like the Guitar Hero controller and Panasonic's hand gesture system, along with various facial recognition systems as the reason that mice are becoming less and less useful.
That becomes less useful".
"That's happening everywhere except in government, and to me, that means the government we have and the approach to government is becoming less and les useful to society".
With the advent of global migration, however, this is becoming less practical and useful.
