These are all conditions/questions that must be considered prior to unprotected sex....personally, I feel you must
want children enough to take on the responsibilty for ANY problems they might have....one cannot (should not) abort children for convenience....what if the couple wanted a boy but got a girl? What if they wanted twins but only (God-forbide) got a single...your argument works both ways in both extremes.
Quality of life is not based on financial or physical standards....(if it was I would the MOST unhappy/miserable person on earth
).