Dude I see weed as fine wine and that is the problem, my mind is telling me that some big ass company will start making good shit and selling it for peanuts.
I have to rant here just a bit (don't take this as a personal attack, it's just something I feel strongly about).
Honestly though, I don't think the 'fine wine' argument works in the real world... For example, you are already competing in the black market with Mexican organized crime, dirt poor third-world farmers, and grow houses that are all bringing a very substandard and overpriced product into the mass market (more often than not in a way that resulted in people being killed, bribed, kidnapped, arrested, etc...). It's exactly like during prohibition of alcohol (going with the wine argument) - the quality was not better because alcohol was illegal. Quite the opposite - quality of alcohol suffered horribly and even the worse alcohol was being produced/bought/sold/consumed because that's all many people could afford due to the extravagant prices and there was extreme profit in it. Just like dried-out, bricked-up, seeded schwag that goes around the market with cannabis. Likewise, prohibition in the US had no impact on the quality of *good* wine that was being produced legally overseas - you just had to pay such a massively high price for it thanks to mafia controlled importation (mainly Italian) that good wine was not within the means of most people.
If you are concerned that companies are going to start packaging and selling cannabis just like cigarettes/tobacco and the result won't be as good as what you can grow with love and attention yourself? Guess what? It's no longer illegal, so feel free to go right ahead and grow even more than you were before, to the highest quality you want, and trade good genetics with anyone you want to continue improving the quality with less expenses and never purchase a commercial product. Just like you are also free to make wine by growing grapes and brewing your own wine or spirits to whatever quality you want.
There is no loss to the quality of what you grow yourself regardless of legality... In the end, it's all about the money one personally can make on prohibition while competing against the death and corruption that organized crime brings to the market AND what law enforcement can keep from being bought and sold on the market by arresting people and confiscating property.
For the argument that it would be bad to have the government involved in growing cannabis... the government is already involved in the growing of cannabis for profit. To the point they will break down your door, shoot your dog, arrest you, take your freedom away for years, and confiscate all your property for growing for profit. Is this *really* better than having to pay a tax to produce a product for sale? I personally couldn't see any involvement being worse than it already is.