Im not sure why they dont want to continue down the 2 yr plans. This only makes me want to try other carriers now. I probably get a phone line plan with Apple and can jump carriers whenever i feel like it.
I believe T-Mobile started the trend and AT&T and Verizon had to follow suit to stay competitive. Also the 2 year plans were generally way too expensive. Once other companies started offering unlimited texting and data for $30 per month AT&T started losing too many customers.