right. Ignoring turnover percentage, a good NBA shooter hit's close to 40% on 3s, which is 1.2 points per possession. If you are going to shoot a 2, it has to be 60% shot to equal the same 1.2 PPP. When the trey came into the league, the better shooters hit them at about 30%, which is more like 1 PPP, which wasn't that much different from their team's regular offense. So the increase from 30% to 40% success rate on threes becoming common has completely remade the game.
I'll tell you what might be fun though, take the line off the court. Then the players would just have to judge where they are on the shot (of course that's still easy on the baseline....). Let a computerized scoring system instantly credit the point if the shot was actually long enough. I would guess that one of the things that has allowed the 3 point make percentage to climb over the years is that the line eliminates the need for the player to judge his distance to the hoop all that well, he just has to develop muscle memory shooting from the line. Take away the line and that would add back a layer of added mental difficulty. 🏀