I think that for the most part older quilt patterns from the early times, say the beginning of quilting to perhaps the end of the 1950's don't go out of style and are truly quilting classics.
The 'new' fab quilt patterns from the flower child era of the 1960's, the war years and times of the 1970's through the MTV times of the 1980's probably are not something that are going to be classics.
I think for the most part, quilters seem to be going back to the true classics of the Log Cabin quilts and classics from the late 1700's through the 1800's and the early quilts of the 1900's up to the 1950's.