Before teams took an almost guaranteed 1 or gambled for 2 in certain situations. The XP conversion was about a 100% gimme and 2 pt conversion was about a 50% chance. Outside of specific game situations, it was already basically a coin flip between then. Coaches being conservative usually go for the guaranteed 1. Now the ratios are different and the XP conversion is only a 90% chance. That makes going for two the right choice almost every single time. Once coaches figure that out, games are going to be teams struggling and playing real football to get 6 points and then some gimmick play is worth a third of all that effort. So many games will be decided by team's ability for this one gimmick untimed play from the 2 yard line. That's not football.
You can't just say it was about a 50% chance. The actual numbers here are important. Rounding defeats the purpose.
Before the Expected value of a kick was 0.99 points. Before the expected value of going for two was 0.95 points. The clear choice unless in late game situations was to kick the ball.
32/33 yard field goals were converted over the last 10 seasons at a 91.6% clip. Over the last 3 seasons that number is 94.4%. Last year it was 96.7%
This article..
http://fivethirtyeight.com/features/kickers-are-forever/...talks about how kickers have gotten better at an almost linear rate and so we shouldn't be surprised that these percentages are trending in an upward direction.
What would kickers need to convert at to make a coach indifferent as to kicking the ball or going for 2? In other words what percentage of makes would bring the expected value of kicks to 0.95 points? Well 95%. As you can see we passed that mark last year.
Also when you consider that kickers will get to select where to place the ball on PATs (a luxury not always afforded to fgs where our dat comes from) its reasonable to expect that PATs will be made more frequently than equidistant field goal attempts.
Sorry your numbers are just off and oversimplified.
I expect the biggest difference in PATs vs 2 point conversions will come in bad weather. You can boot a PAT from the 2 in very bad weather. You can't necessarily make a 33 yard field goal.