You are correct that they are cracking down on green card holders.
But.... There is NO residency requirement that is spelled out in the law.
If you leave the country you need to return within 6 months or they can review your status. If you are gone for more than a year, you need an re-entry permit.
Having a house, car etc, will help your case if you run into a problem
WWW.ins.gov
From what I have been hearing, people that never return to the USA or stay longer than the 6 months repeatedly are the ones losing their status. They were never really looked at in the past.