This would be like the government proposing buying up a big portion of argricultural tractors and running hours on them until their engines wear out, in order to help the economy make more tractors. Cash for clunkers without the environmental rationale.

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.