Yeah, the gist of the idea has been covered already. Short, lightweight, adequate caliber for most all situations(.308 Win/7.62x51), quick target acquisition, and ability to use stripper clips to topload mag are most of the generic ideas that I've heard of for a Scout. Getting all those same things together on the same gun at a decent price point without substantial modification is a different matter.
A big portion of the concept that some people do not seem to account for it that it's intended as a Rifleman's rifle, not a sniper's rifle, not a designated marksman's rifle, or a target shooter's rifle. A whole lot of people seem to buy a scout rifle and then go out of the way to mount a receiver scope on it.
A proper, affordable, scout rifle could very easily be made except that technology and market demand has gone in other directions, namely the AR for actual combat, or the shooting bench at the range. Stripper clips don't mean much when you're sitting on the bench with a collection of mags lying beside you and can reload at leisure, and short length combined with light weight and a high-intermediate caliber means it's going to be loud and kick, making it an undesirable range gun. Quick target acquisition doesn't mean much when you're only shooting at a single stationary paper target.
My personal opinion is that Cooper's scout concept, or at least my idea of it, are stuck in "the fifties that could have been". Had the major armed forces not adopted the AR and various semi-autos, the scout rifle would have been a sensible evolution of the Mosin-Nagant, Lee Enfield, and Garand generation of infantry rifles as it carries over the features that work and attempts to improve in those areas it can to get a rugged, reliable infantry rifle. As it is, the idea is a bit dated and niche as a result. Most people seem to want bench guns, the kind that must shoot sub-moa or they're garbage because everyone knows you can't hit the broad side of a barn with a 4" group at a hundred yards, let alone a person's 6" head, or the even larger vital areas of most large game. The scout concept is not about a single perfect shot it's about a powerful snapshot in fluid circumstances.
Or something.