“Army's fiscal 2025 budget request, the service has a long-term plan of buying 111,428 XM7 rifles, 13,334 XM250 automatic rifles, and 124,749 XM157 Fire Control devices..”
www.military.com
I will agree that non-combat arms units will be using 5.56 for a long while, however historically when the US Army fields a major weapons system, other services and allies tend to follow. The main driver was lethality issues at longer ranges.
Back to hunting, the 77g 5.56 certainly has its place, specifically smaller static animals at shorter ranges. I would not classify 5.56 as an “all around” big game cartridge as indicated by the thread title since there are so many other great options.