Interesting thought, however I hardly use my 8GB as it is. This is because I use a lot of synths and effects. These plugins do need a lot of processing power but hardly use any memory.
On the other hand for someone who would use samples frequently (I'm talking huge, 500 GB libraries) would need a lot of memory, but even then I think 16GB would suffice. And if it is not, it is always easy to add a few memory modules along the way.
Yeah 16GB is fine for now
what DAW are you using?