I dissagree....
... if ebay pushes out the small sellers it will open the door for some one else to step in and grab that market. I don't think ebay will give up that market (willingly). Once sales drop they will re-adjust, simple economics. I would like to see ebay with some real competition but they have pretty much cornered the market and it will take a lot to be a threat to ebay. If ebay is the only game in town they will charge like they are the only game in town (at least until it hurts business).