>they own a house on a single income.

You want aspirational, look to Family Guy. Somehow Peter Griffin can afford a helicopter, a jet pack, and whatever expenses are required to obtain the foot of the statue of liberty.

>maintaining a 90s style of living is just not realistic in the 2020s

I think even in 1989, when the show debuted, two income families were starting to be (or already had been) pretty typical. I think the Simpsons might have been poking fun at the 1960s and 1970s family sitcoms where the dad went to work and the wife stayed home.

Edit: But you're right that in the 80s and 90s you would have a decent chance of buying a house (on those two incomes).