The question is, who will be paying for this advertisements? We have a large amount of Bitcoin companies that are barely making any profits now, with the price being this low and some are even struggling to keep their heads above the water.
We could crowd fund this, but Bitcoin hoarders are clinging onto their coins now and people are not using or selling their coins now. It does not make any sense to use coins, when the price is this low.
The only inexpensive way to market Bitcoin now, is "word of mouth" and "natural adoption".