It wouldn't have a noticeable difference. While almost everyone in the libertarian party would support massive drug reform, it is not the central piece of our political philosophy. Perhaps our stance on drugs attracts some amount of people initially to at least check out the LP, but most people who join are not joining solely for the drug position. There are larger positions which revolve around free market capitalism and minarchism which are not found in the main party. You can legalize drugs tomorrow, but that's going to do little to nothing to our membership as there are no other party platforms out there which match to our own personal ideologies as much as the LP.
I know some people think it's cool to make fun of libertarians and such. Chuckle or make retarded threads trying to condemn or poke fun or make us look bad. It says more about the person making those comments, however, than it does the libertarian political philosophy. But don't worry, we're not going to do anything about it. World's full of idiots and douche bags, but there ain't no law against being either of those.