poly blends tend to wear very well-last a long time-
you should check the packaging and see what the quilting recommendations are- it is important to quilt as the batting suggests- some batts allow up to 10" between quilting lines & state are good for tied quilts- other batts need to be quilted every 2"-4"...often high loft batts allow less quilting. your quilt is lovely and as long as it is quilted or tied to the recommendation there is no reason to not think it will be around for a long-long time