"The point is people are more brand loyal to Apple - Samsung is just another Android phone."
It's the "brand loyal" that makes people judge you.
"When it's due for an upgrade the user may as well buy a HTC, Asus, Motorola, Sony or one of many, many more."
Yep, it's called choice, a healthy market, it's what keeps prices to a minimum.
"So what are the chances of someone buying a Samsung Android phone today definitely buying another Samsung Android phone in 2 years time", Who cares? You're saying this is worse than sticking with Apple for the rest of your life?