It is true that Nintendo doesn't have games with awesome graphics, awesome cars, "pretty" guns or with references to terrible real world wars that appeal to the lust of violence in human hearts.
But few companies can match Nintendo's franchises, Zelda, Mario, Metroid such games have written their names with pure gold ink. A lot of gamers know of games thanks to Nintendo's great work. Admit it even you used to say: "I'm playing Nintendo" whenever your parents asked you about.
A kids company ? Yes indeed, forever ! Nintendo managed to revived the industry thanks to its "kid-company" format, and even today tries to appeal to young ones, may be coz all those little gamers playing Nintendo games will take our place very soon and Nintendo wants to remain a choice for em in a near future.