Well, the price of developing the drug would be the same right? However, rather than paying for this up-front at the counter, people pay through taxes. There is no difference in the amount of money needed, the difference lies in how the money gets there.
Besides, 2,6 trillion is only an 18% income tax, that will not be sufficient no, such a proposal requires higher tax rates than that.
But since socialists have approximately the same social status as a heroin-addict in the states, this will not happen. I'm just theorizing.