The article cites how the Oxford Movement led to its demise in the middle of the nineteenth century:
The end, or rather, the deliberate destruction, of WG music is usually credited to the Oxford Movement, the coup de grâce being delivered by Hymns Ancient & Modern. This simplifies a complex progress, and does not explain the simultaneous change in the Free Churches.
From the late-18th century, the Church of England had begun to put its own house in order. The Pluralities Act (1838) stopped well-connected clergymen acquiring a number of benefices. Clerical salaries were improved, and those of bishops and higher clergy made more equal. There was renewed church building: more than £500,000 from public funds and £5.6 million from private sources were spent on new Anglican churches between 1831 and 1851 alone. . . .
Read the rest there.
The author doesn't completely explain what the Oxford Movement had to do with the publication of Hymns Ancient & Modern. Part of the Oxford Movement's purpose was to revive and restore the treasures of ancient hymns in East and West, Byzantine and Latin. Therefore, the new hymnal contained translations of hymns by the Greek Fathers of the Church by John Mason Neale, of hymns by the Latin Fathers by Edward Caswall, and even of Lutheran hymns by Catherine Winkworth and Jane Laurie Borthwick--and from John Keble's The Christian Year, among others. It was edited by William Henry Monk and the first edition contained 273 hymns; it was, as noted above, a tremendous best seller and there several other editions.