Of course. But in this case the new one is only weeks away. It's a lot of money to spend so i'd want it to last me a long time. So for me I get the absolute best I can.
Now if the new ones were 6+ months away I wouldn't wait. But a couple of weeks? Yeah, i'd hold off.
Yeah I'd hold off as well, but in the case of the OP he did not hold off. He already made the purchase and now he wants to return it for the reason .... " well a newer model might be out in a few weeks. "
I'll be honest I went into the Apple Store last week to buy a new iMac, then I saw the updates to the MBP. Because of the updates to the MBP I made no purchase and decided to hold off myself. If there is no update in short order, I'll change direction and get a new MBP and an external 30" display. This way if a new iMac comes out a week later I will be fine.
I'm a business owner and I guess my view is biased in that direction. I like to think that when a product is sold, it is sold and won't be returned unless there is a defect.