The lower the ratio sinks, the less weight informed voters have, and the less intelligent the outcome gets.
The modern party duopoly exacerbated the issue (parties mobilize uninformed voters and often actively work against informing them), but voter enfranchisement also seriously impacted.
Universal suffrage is amazing from a human rights and ensuring everyone has political power standpoint, but troublesome when you have poor levels of universal education and ability for voters to inform themselves.
In modern times, with modern populations (US or larger), it feels like indirect democracy might be a better answer.
Allow voters to directly elect non-partisan voting representatives (many, so elections are hyper-local and candidates individually canvas), then pay those representatives a stipend for a few months (like jury duty) which they spend educating themselves on issues. Then have those representatives vote.
At the end of the day, when all the BS gets boiled away and we are left with raw/brutal reality. -- Any group of people attempting to govern themselves will end up with the government their collective will and (i'll use the loaded term) virtue deserves. The only caveat is time.
Unfortunately the U.S. constitution was written with the, in hindsight, naive assumption that political parties could be avoided.
This just led to a system that has political parties but doesn’t really acknowledge their existence and therefore makes it difficult to regulate their behavior.