EDIT: Or is your concern existing solo miners? The previous versions of cgminer could not meaningfully mine solo so I didn't think anyone was trying to.
I did not know this. I have frequently solo-mined with my few Block Erupters in the past, and even with my GPUs in years past, thinking I was essentially playing the lottery. I'm a little disappointed to learn that I was basically doing nothing. (But only a little disappointed; I knew my chance of actually hitting anything was pretty darn close to zero.)