Repairing tractors have never been harder, enter the 21st century and computer software that's now entwined in every tractor and almost all equipment. It can cost hundreds of dollars in call-out fees for a $10 part. For farmers used to fixing their own equipment, it's not only expensive but annoying.
Just look at what is going on in the auto industry. Every car manufacturer is going electric. It all started with golf carts, then lawn mowers, ATV and UTV's and now the agriculture industry is going electric.
Reduce the cost of farming by using electric tractors, that require less repairs and don't need fuel. Producing energy by using solar and wind makes a farm sustainable.