My machine's noise changes slightly when I am running low on bobbin thread. So when I start hearing this more of a rattly noise I know I am low and watch. I bet if some of you really pay close attention you too, will find your machine makes a slightly different noise when bobbin thread is low. My LA also makes a different noise when bobbin is running low. So I am never really surprised when I run out. Yes I have stitched maybe a few inches without immediately realizing but for the most part I know.
Additionally if you load your bobbin with Superior bottom line brand it will last for a very, very long time as the thread is so fine a lot more fits on the bobbin.
I for one would not upgrade my machine for a setup that pulls bobbin straight from a spool of thread. There is a reason we should go into the bobbin race area every couple of bobbin fulls. It's called cleaning and oiling your machine.