Hate to tell you this, but it's always been that way. Doesn't matter if the bus if absolutely empty, if you don't flag down the bus it wont stop. Even if it's the only buss that plies that route, it will not stop unless you flag it down as lots of people are only in the stop to rest their feet, get relief from the sun or rain. So the next time you want a bus, stick yer flipper out there!
In fact, check out the signs inside of the bus and also within the bus stop, there is usually one admonishing the fare to signal the bus "in plenty of time".