No matter how much people say that moving-out doesn't mean abandoning, it's not the same either. You're not there when they need you, no family dinners/breakfasts or bonding time.. you're not spending quality time with them..it turns into casual conversations over the phone.
Would you be able to forgive yourself if Inauzubillah anything happened to your parents in the middle of the night.. old people are more prone to accidents too. I have seen numerous old people go quiet (very educated people) because they're lonely..