Umm ... no
Go reread that article and pay attention to the exact wording used. The "experts" are not feds, their
former agents. So while their
opinion is valid, it's still only an opinion.
The words "could" and "might" were used, those are not definitive words and represent a possibility. A meteor
could hit my apartment building, doesn't mean it will. Just like the FBI / DEA
could attempt a crack down, don't mean they will.
Also remember what I stated earlier. The state is just decriminalizing it, meaning its not a state crime and they won't bother with it. The FBI / DEA rely heavily on local law enforcement for information and support on suspected criminal activities. That support is now gone, the FBI / DEA will have to go about doing the investigation on their own. That gets expensive really quick and the government is under a budget crush.
So ultimately it will come down to priorities. The FBI / DEA will have to prioritize what is and isn't important for them and allocate their limited resources accordingly. Most importantly this means no more midnight / no-knock raids by a paramilitary SWAT team that results in people / dogs being shot. Those teams are part of local law enforcement and while the DEA / FBI have similar resources, well those resources must cover the entire country.
So honestly, this is the best way to go about doing this. Enough states make it incredibly hard / expensive for the FBI / DEA to chase small time Cannibis possession / growth and those agencies will simply stop doing it out of pragmatism. This will in turn eventually force an eventual congressional debate on the mater with the results of it being removed off the Schedule I list of controlled substances. I suggest everyone put pressure on their local congressmen(women) to do exactly this.