The reason for 1 income not being enough anymore is because of the large scale entry of women into the workforce. Over a generation the workforce almost doubled while the increase in GDP increased far less - same pie more pieces. Is putting even more people into the economy going to fix that? I don't think so. I also don't think funding programs like this through deficit financing is dong that generation or their children any big favour.
And just because some here have a hair trigger let me explicitly state that I don't care if it is the father or mother that stays home to look after the kid so this is not any kind of appeal to send women "back to the kitchen" as it were.
But my main point was, and is, if you already can't afford to meet long standing commitments you don't start new spending in other areas.