Why should he? If the Thrill meets his needs and wants in a phone, then he has no regrets and shouldn't be chastised for it.
I'm waiting on the SGS2 and if that phone does everything i need it to do without any major problems then i wont have regrets or buyers remorse.... not even if the Prime or Holiday or whatever else comes downt the line. It's inevitable that newer/faster/better performing devices are ALWAYS right around the corner. Just get what meets your requirements/wants and be happy.... without judging others' decisions