Well, if your premise is correct, then clearly very few people are studying the game, much less GM games. However, book sales and Internet site records would seem to contradict this.
It's not *just* the 1600 and up players who are studying correctly and regularly. Indeed, the vast majority of chess shopping and Youtube watching is from the lower half...since they comprise the vast majority of people who WANT to get better.
And it ain't working.
Yes. It's not like every move by a GM is absolutely brilliant and mysterious. Many (if not most) moves are quite standard and can be understood with some effort and guidance. Computers can be used to resolve tactical difficulties you encounter in personal analysis. If you develop a defeatist attitude to game analysis, you stop trying to expand your comfort zone and you prematurely plateau. It's probably better to start with older games that are easier to understand. Logical Chess: Move by Move is a good game collection for the beginner. Get a board out, set up the positions, cover the remaining moves, and at each turn try to figure out a move for one side before reading on. Puzzle books can help with calculation. Review games repeatedly and you will see more each time. You're not going to understand everything overnight, but you will make progress. A large percentage of players will just browse games they see online. This is a more passive approach to study and is not the same thing.