Changing long held power structures is not an easy task. Those in power have held it for so long, without a considerable number of electees coming foreward, of high calibre, for the next elections down your way... unfortunately these people will ged squashed in the process. I would also think there needs to be non party affiliation, as most countries who have party politics have excellent Candidates who don't get into power. There have been periods of natonal emergency in many countries where party politics have been suspended in national emergencies.
I am not going to ramble on about other countries politics, as everyone has their own economic and political vision for themselves.