Let's see if I get this right...
Your argument is that by removing the legal penalties for posession of (certain) drugs, that would remove the reason for "no-knock" type entries, and we would all benefit.
A logical idea, and one that could possibly work, if people weren't involved. Unfortunately, people are involved, so I see little hope of your idea working the way you envision. History shows us this.
After the repeal of Prohibition, Govt agents didn't go away, they just shifted focus. That would happen today. Repeal of Prohibition did end the violence associated with the illegal alcohol trade, and would likely do the same to the illegal drug trade today. However, Since the Feds needed something to do after making alcohol legal, they turned to guns. I would expect something similar today.
What do you think all the agents, officers, attorneys, and prosecutors who do nothing but drug cases are going to do if you can decriminalize (certain) drugs? I fear that it would have just the opposite effect than the one you theorize. Instead of getting them to lighten up and leave us alone on the gun issue, I think that if they were to "give" us the drug thing, they would demand our guns. ALL OF THEM, or as many as they could get.
This is the pattern being used in Europe. Many European nations have relaxed (compared to the US) drug laws, and very, very restrictive gun laws. As there are people who are actively working to create a "global society", and it is not the US model that they are using, I think they would be glad to trade the "War on (some) Drugs" for the "War on gun violence" (or whatever catch phrase they come up with).
After all, (according to them) all the masses need are bread and circuses, and if they can get us to give up our guns in return, they will be very happy for the opportunity.
Govt types have a long history of being very reluctant to give up any kind of power, or organization, and if we get them to turn loose of one area of authority, it is quite likely they will expand their authority into another area to compensate.
FYI, whoever is watching the History Channel isn't getting it quite right. Drug laws have been patterned after gun laws, not the other way around. One show (about Marijuana) made a particular point of explaining how at one time, the laws were modelled after the laws covering machineguns (tax stamp, etc.)
I wish your idea would work, but I just don't see it happening. And I feel that the potential for unintended consequences is just too great.