I tend to feel that a skillfully made quilt, done by hand, is more likely be deemed an heirloom quilt, than one quilted on a machine, unless the machine quilting is of exceptional quality.
With that said, all quilts are not made with the intention or purpose to be considered 'heirloom', but are lovingly sewn to be used in all manner of ways. It is a wonderous thing to see so many different artistic approaches in the many quilts being done today. I love seeing new and different techniques of using fabric to make all kinds of quilts, from bed quilts, to lap quilts, to wall hangings and clothing. There is room for everyone to express themselves thru using the techniques of their choice. In fact, I believe that it enriches this experience we call quilting.