Q said that the plan is three years in the making, so I started wondering what happened three years ago that triggered the planning.

One potential lead:

https:// www.lrb.co.uk/v38/n01/seymour-m-hersh/military-to-military

Hersh claims that during 2014, the DIA and Flynn under Obama began unilaterally sharing intelligence with Assad to help him fight against ISIS. They were not happy about Obama giving arms to Al-Qaeda affiliated Syrian rebels, and even tried to interfere with some of our arms shipments to them.

Perhaps that was when they crossed the rubicon and realized that a full takedown would be necessary to root out all the treason in the swamp.