My simple point is to decentralized the mining pool - the simple fact is that if there are more private miners, the lesser mining groups will control bitcoin blockchain. It's happening now, miners are pick and choose which tx are worth while for them to mine...and yes, I'm talking about people whose has larger investment are at stake - and they better do something to protect their investment
For Bitcoin to be truly decentralised, each of the miners have to solo mine and not be mining for any other people. Mining pools can push for their own agendas and it is difficult for anyone else to detect. The fact is that, sure you can decentralise Bitcoin but it would have to come at a cost of people not being able to gain their investment back. And of course, who does the investment go to? Those mining companies that control a significant portion of the hashpower.
I certainly won't be mining, no matter how much I own. Because I know that the current price trend is not a direct relation to the monopolistic scene of mining. Miners aren't stupid, they would obviously try to pick those with higher fees.