The word for the day is moribund:

• Main Entry: mor·i·bund
• Pronunciation: \ˈmȯr-ə-(ˌ)bənd, ˈmär-\
• Function: adjective
• Etymology: Latin moribundus, from mori to die — more at murder
• Date: circa 1721

1 : being in the state of dying : approaching death
2 : being in a state of inactivity or obsolescence

Thanks to Merriam Webster online.

Example of usage:

Poetry is not dead, but the PoemFray is definitely moribund.