tl;dr
Now go make me a sandwich

random brick wall exists by these rules. some people are more interesting than others. his daughter might want to be more interesting because of other girls, who are her rivals, not because she does not find any husband.

Booooooooooooooooooooooooooorrriiiiiiiiiiiiinnnnnggggggggggg !

His letter seems to imply that there is no more to life than meeting a boy for his girl. She may want a career, be a golfer or an astronomer. There is a lot more to life than marrying and having kids.

Or maybe she'll meed the girl of her dreams and throw this letter away