The two situations are not comparable. For starters bitcoin is a global currency while the situation you explained is only a local one. Not to mention that a currency can not be taxed but an investment can and they have already done that so there isn't much left to do.
Besides the situation you explained was in a place where the government was starving for revenue so they had to do something, we aren't in that situation in 90% of the world. And bitcoin is not going to provide any more revenue for the government than it already does (taxing the traders).