I watch a lot of baseball and I have to say that the umpires keep getting worse every year...
what I think is that there may be some truth to that but...
actually I think umps have been making bad calls and missing or getting incorrect as many as 25% of all the close calls for years -- even for decades..
it's just the facts (see below **)...but now we see how often it is because all the sports now have something they didn't have before --
ultra-slo-mo replay on every single play.
**everyone knows that a movie is NOT a continuously moving scene, but instead a series of usually 24 separate still pictures per second being cast on the screen, right?
So how come the human eye and brain sees 24 separate pictures as one continuously moving scene?
Because the eye works in a manner, that any light hitting the retina, then takes about 1/20th of a second to reset the chemicals before being able to see again...so as long as those separate frames in the movie change faster than 20 per second, no human eye can see that it's actually just still pictures...it looks like "normal", continuous activity...
BUT -- if your eye sees something moving fast..like a fastball at 80-90 mph, then do you know, that you don't really see it all the way to the plate...
you instead see it as a single image in the brain every 1/20th of a second, and your brain "fills in" the images so your mind thinks you've seen every part of the trajectory of the moving ball -- but you haven't...
thus, any fast moving action becomes just a little less possible even for the most astute eyes and mind to be sure of...there's ALWAYS a certain probablility of getting your conclusion wrong no matter how sure you think you saw it.
How many times have you thought you saw a play one way, then the ultra slo-mo (which has upwards of 200 frames per second) allows you to see you got it wrong the first time when you saw it in real time? -- in other words -- your "mind played a trick on you".
But this is the limit of human ability that umps have to deal with .. and it'll never be solved when calling bang-bang plays and fast/instantaneous action, unless all the close plays are reviewed on slo-mo, something that I think nobody really wants.
I think this also accounts for all the missed "off sides" calls we saw in the World Cup.