The works of Johann Sebastian Bach (1685-1750) were rarely performed until the 19th century.

Sergei Rachmaninov (1873-1943) was considered irrelevant by many of his contemporaries because of  his use of traditional harmonies and tonality.

Josquin des Prez (1455-1521) was considered one of the greatest composers of his time. When was the last time you heard something written by him?

The music of Frédéric Chopin (1810-1849) was initially considered excessively dissonant.

Predictions are tricky. The future is not readily known. Many trends which seem strong now are only passing fads.