Okay, I said I would stay out of this, but yours is a reasonable question, MGibson. I’ll make a brief foray into a most basic premise: whale populations.
Whales have an extremely long gestation and calving period. This has been used to the advantage of hunters even in the recent past, but I’m not going to go there. Let’s look instead at some of the whales that have been historically targeted for hunting. Most or all of these species are theoretically protected by IWC convention, but there are loopholes such as that Norway has used to continue whaling in general.
Right Whale
Current population: Approximately 350 adults. Life expectancy for females appears to have dropped from 50 years to fifteen, according to some sources. Short-term outlook is encouraging; long term outlook has the big E written all over 'em. Some claim the name of the whale comes from its desirability; it has a large blubber content and is one of the easier ones to catch, hence it was the “right” whale to find.
Blue Whale
World population is estimated to be somewhere between 8,000 and 12,000, not much more than the size of the North Pacific herd before commercial whaling began, according to that site. Outlook is largely speculative.
Sperm Whale
World population is probably over 100,000, according to this site. These guys are not baleen whales, but appear to be mostly predators. If any critter other than man is going to compete for the fish we eat rather than the krill and other cephalopods we’re going to want after we eat all the fish, these are probably the biggest and most well-known.
(Here is where I as a whale-saver would digress into the origins of the Japanese paradigm that seagoing mammals compete with fishermen, and the grisly results that used to come from such percieved competition. However, modern Japan has evolved to a more modern line of thinking in recent years and now they eat small cetaceans as well.)
Ahhh! I’m sorry, I can’t go on with this, and I’m sure I’m not helping you at this point, MGibson. There ain’t a helluva lot of big whales left. Some species, like the Right, are probably finished for good. Whales have problems just from getting run into by ships and entangled in nets. And they sure do a lot of gabbing with one another for daft sea-cows, which is why I cannot discuss this issue rationally.
Hopefully someone will come in and delineate some less ethically charged reasons for allowing the large whale populations some respite.