There will, of course, be insiders who don't get their piece of the power so they will gravitate to another party that also seeks 50%+1 votes ~ over time this will become THE SYSTEM and as the parties divide up the affiliated factions over minor issues, they will even begin to look like each other.
If you want to change America you create multi-member districts and you will move coalition politics into the Congress and the state legislatures. Within weeks you will have 50 to 1000 political parties.
If you reflect on what you said you are looking back nostalgically to the Federalist point of view ~ they imagined that if only men of property and education selected the officers of government everything would be just peachy ~ for them ~ forever.
Jefferson knocked that idea in the head and the Federalists faded from the political scene!.
As James Madison posited a month before the Constitutional Convention:
"The great desideratum in Government is such a modification of the Sovereignty as will render it sufficiently neutral between the different interests and factions, to control one part of the Society from invading the rights of another, and at the same time sufficiently controlled itself, from setting up an interest adverse to that of the whole Society."