I'm on the fence. On the one hand, the new MBP is a fantastic machine and if I pay the premium for the 16GB of RAM, I'm probably going to be set for years.
That said, I'm currently running the original Late 2008 Unibody Macbook Pro. It's survived for four years because I've been able to, over time, upgrade the RAM, replace the spinning disk with an SSD, and replace the aging battery. SSDs weren't available when I purchased the machine, but because it uses standard connections the upgrade was easy. I didn't pay an Apple premium for RAM, I waited a few years and the price dropped even more. And the battery was a 2-second replacement.
I don't know if I'm comfortable giving that ability up.
That said, I'm currently running the original Late 2008 Unibody Macbook Pro. It's survived for four years because I've been able to, over time, upgrade the RAM, replace the spinning disk with an SSD, and replace the aging battery. SSDs weren't available when I purchased the machine, but because it uses standard connections the upgrade was easy. I didn't pay an Apple premium for RAM, I waited a few years and the price dropped even more. And the battery was a 2-second replacement.
I don't know if I'm comfortable giving that ability up.