if samsung doesn't improve touchwiz and move to more premium material for their phones it will take no time for HTC, Sony, LG, etc. to destroy samsung's dominance.
Geeks know how to easily get rid of Touchwiz and non-geeks don't even know the difference. Most iPhone users I can see here on the train have their iPhone 5 in cheap plastic cases, so much for premium material.
We got 30 staff and all need phones. Our policy is that each individual can choose their phone after probation.
Out of 30 we got 21!! S3/S4s, two iPhone 5 (one is even a private one and he didn't want a new one), two HTC one, 3 Nokias and two Blackberries.
Plastic and TW is clearly not an issue in our company.