There you go...starting trouble.....
This is an often fought debate. My take? You'll never see the simplicity of those old tractors again. That lends itself to a long life. Any shadetree mechanic can keep the oldies up and running. The new breed of tractors won't be as economically feasable to rebuild out under the old oak tree as grampas FarmAll or 8N. Reliability is there, but high tech issues can shut 'em down in a heartbeat. Just like cars and trucks of today, there's a practical limit as to how much time and money can be devoted to keeping a well worn modern tractor on line. They're fabulous when new, pretty good when old, and a nightmare when they reach a certain point. That's what keeps the value of older tractors at the disproportionate levels they are at. Tractors of today will outlast cars and trucks of today, but IMHO, when todays crop of techno-wonder flash tractors are dead and gone, those oldies will still be out plowin' the neighbors garden.
Again, IMHO, there is the logic behind a SIMPLE, BASIC, "mid-tech" tractor of today. They might not draw a crowd at the county fair like a fancy option laden high tech tractor, but in 25 years, we'll see which one is still operating at maximum efficiency.