Continuous obsolescence / Perpetual revolution
Where industry trends (or the whim of fashion) leads to more work being done re-writing existing software in a new environment than on improving its features. The initial investment is therefore not given time to pay back.
This is related to the marketing efforts of commercial vendors. It can also be driven by the need to remain compatible with other businesses systems (e.g. the dominant office package) where these are not based in inter-operable standards.
The technical managability and licence costs caused by upgrades now attract serious attention.