On the other hand we know the Talmud Yerushalim in Peah says that one word of Torah is worth more that all the mitzvot.
This can be understood in two ways. This idea of one word of Torah being worth more than all the mitzvaot might refer to just the bare obligation. Or it might refer also to all the words of Torah one learns after that during the whole day.
Now we know that learning Torah during the day after one has fulfilled the bare obligation in the morning is not the exact same thing as doing a mitzvah that one is not obligated in. We do find in the Talmud that when one has a mitzvah in front of himself or learning Torah one should learn Torah. This seems as far as I can tell to the non obligatory of learning Torah during the day that one is morally obligated to do even though he has in fact already fulfilled the obligation by saying the Shema in the morning.
[This discussion shows why one must stop learning if a mitzvah comes up that can't be done by someone else. This is simple. Since one has fulfilled his obligation in the morning therefore any obligatory mitzvah that comes up later obviously one should do instead of learning]
Now on one hand they are right that everyone should learn Torah. But frankly I feel kind of like the German Jews that came to America that were based on the teachings of Shimshon Refael Hirsch--that they took an unbelievable degree of offense at anyone that even suggested that their children should not go to collage.