Meanwhile, in the last 159 years, the US has only had Democrats and Republicans.
Also, even if minor parties do not get elected, they offer healthy competition and keep the main parties on their toes. Candidates in the US hate to present concrete plans or answer specific questions. They only have one opponent, so they take the least controversial stance that will differentiate them against the other guy. Offering more information than this minimum required is bad strategy.
If other parties were in the running, candidates would be forced to take positions and offer plans, because they have to differentiate themselves from several opponents.
I don't think changing how we elect people counts as "rebooting the entire system". We would have to eliminate the electoral college, but who would be against that? It is a relic left over from the days when local election results had to travel on horseback with a trusted messenger.