Translation

廃れつつある / 時代遅れになりかけている / 陳腐化しつつある

Meaning

Obsolescent means becoming obsolete: still present or usable, but clearly on the way out. It is useful when obsolete is too strong. An obsolescent technology may still work, but people are gradually replacing it.

Examples

• その装置は廃れつつありますが、現場ではまだ使われています。
  The device is obsolescent, but it is still used in the field.
• 会社は陳腐化しつつあるシステムを段階的に更新しています。
  The company is gradually replacing its obsolescent systems.