That would be bad because of the CO2 emissions and because it's a huge waste of government money.

It would not be bad for long-term tractor availability, if they kept up big purchases for many years. Especially if tractors were a hotbed of research and improving by orders of magnitude.

Or to put it another way: It's a hugely inefficient way of boosting tractors, but it will in fact boost tractors. It's not a good idea overall, but it will have some positives.