Green cards are not issued immediately after application, the process takes many years. During that process employee is even more vulnerable than a plain H1B w/

Green cards are not issued immediately after application, the process takes many years. During that process employee is even more vulnerable than a plain H1B w/o pending GC application. >If the intent was truly to fill positions with H1 then they should be laying off H1 employees every 3-5 years and rotate them with a fresh crop of H1 so that they never have to set their employees free. There are only 85000 H1B visas available per year (65K regular and additional 20K for people with masters degree from an American institution). That's not nearly enough to do what you propose.