Don't need them.. They already have smart meters and H-Land Sec, weather manipulation and race wars. Just have some local Nat'l Guard for PR purposes, a R.Cross interviewee on the news and there you go. Everyone helping the helpless to die. I haven't forgotten Katrina (no water, get on a bus/don't come back). I haven't forgotten Harvey (snipers, portable gas tents). And I sure haven't forgotten Paradise (become the bbq you love). As of a couple months ago, my town is now set up with smart meters for a Paradise event if they need one. They sent a letter to all home owners few yrs back to say if they wanted to have the city install a 'backflow prevention valve' in the gaslines they would have to pay for it themselves. So have a local catastrophe and just play down the numbers and walla - just another blurb on the news, nothing new folks, just keep on moving....
Like you say, they are ready for their new form of human, the next stage of their plan to come on board. They have used up our genetics so want a new slate, we have finally started wising up, but are basically out of gas in the middle of the road. I think one group was ready for a reset and another factions had other ideas. Seems to me anything non-Terran is hostile and any humans out there already have their own problems or no longer know about us. To think anything else is like saying, oh yeah, too bad we had to put down all those puppies, they're just mutts anyway.... But mutts can do some ingenius things too. Everyone remembers Rin Tin Tin or Lassie, but they have totally forgotten Old Yeller.