This is a great thread and the most important part of hunting. Hunters who are succesful year in and year out know how to glass. If you can't find it you can't shoot it I don't care what kind of rifle you got. Unfortunately most hunters are way lax in this area. I have hunted right behind groups of hunters many times and taken great animals right behind them because they were not good glassers. Just this year two guys came through the basin we were camped in for elk. They hunted all day and left disgusted that they were seeing sign but the elk must have left the country and they were headed for home. During the day in the same basin I watched those guys all day looking and spotted 50-60 elk scattered around the slopes of that basin. I knew where to look, how to look and the discipline to keep looking because I knew they were there.
One very important thing. Keep your glasses perfectly still while searching out every square inch of space inside your field of view until you are certain nothing is abnormal in that field before moving on. Then pick another likely spot and continue the process. You have to know how to let the glass become an extended part of your body and a part of your eyes and this is much easier said than done. People who are excellent glassers know what I mean. But you just get in the zone is the best way I can describe it. The only thing on your mind is complete concentration on your target area and you just become a part of that area with complete feel of anything that moves or is abnormal about the area. I have spotted bark falling off a tree from a woodpecker at 1000 yards then found the woodpecker. That is being in the zone. If it is there and your in the zone you will spot it. I have looked at a spot for extended periods because it just wasn't right but nothing definable was there until the sun got right and the slightest movement revealed the shiny nose or antler of a monster. Also as stated earlier if you are not spotting numerous trophy rocks/logs you are not glassing properly. If you are not seeing individual twigs, grass clumps etc. you are not glassing properly.
Through the years many times I was underglassed compared to many of the people I hunted with. However I was a better glasser and spotted way more game than people with much better glass. Better glass is better, but better glassing skills is best.
Predictions are difficult, especially when they involve the future