It is the budget. That is it. The U.S. Army's budget has not had real growth, beyond cost of living for soldiers, in four years (or more). The U.S. Army cannot afford many of the programs because of cost, which continues to grow. These cost are hidden behind phrases like"supply chain disruption." Other casual factors include funding external concerns.
Because of this they have wedded themselves to UAS, rightly or wrongly. Because of cost, nothing else. Generals will espoused the new age of warfare and other catchy quotables, but in the end they are about stretching the funds.
Another reason for the demise of FARA, like all the other reconnaissance helicopter programs is the arrogance of the Army Aviation branch. The high egos, necessary for combat pilots, made them believe it was obvious as to the necessity. They felt no need to get buy in from the rest of the Army.
There is however a replacement for the lost FARA, and the Apache as well. It is the FLRAA, the flying truck. By 2050 I propose a much smaller Aviation branch will have two aircraft types; CH-47Z+, and FLRAA.