From a cold, business perspective I believe it is all about dollars and cents.
A corporation is in business to make money. If a product line isn't bringing in a certain amount of revenue and profit to the corporation then it is discontinued.
There are many cases of superior products that were discontinued in favor of inferior products (Beta lost to VHS, HD DVD to Bluray, any political campaign )
There are 1000's of fragrances released every year around the globe competing for market share with all the existing fragrances.
A developed nose with the ability to discern many individual notes is something that very few possess and therefore the nuances and complexity of a fragrance are lost on most people.
As the old saying goes "you never go broke appealing to the masses".