Eventually, everything is done to help a small trader to stay in the Market. CME has to be very carefull when ballancing tick size for a popular contract like "ES". They want and need volume, at the same time, they can not afford for the contract to loose popularity with large players. The larger the tick size in any contract, the more advantage large players have. One of my friends was a large Q's options trader, and when they changed Q's options to one cent tick, he stopped trading them. The smaller the tick size, the less of an edge the pro has. I dont think we will see smaller tick size in "ES" anytime soon, but I would like to see it smaller, maybe not $0.05, but $0.10 would be nice, that is why I trade Russell mostly, when you have specific entry and exit points, smaller tick size helps a lot. I can not tell you how many fills I missed by a quarter in ES.
Good trading everyone.