How long the printer can be used is not important, what is important is their depreciation cost. DTF economy is mainly about small batch production, not like DTG.
Small batch production is usually characterized by increased cost of consumables. In this regard, DTF is no exception. In this technology, the printer is the cheapest consumable. This is the flexibility of DTF technology.
While the owners of DTG printers are exploring how to recoup their millions of dollars of investment through a moderate order volume, many employees have already purchased DTF printers for profit when the order volume has decreased.