While it's true there were less 6 Pluses made than the small 6, that doesn't equate to the reason why the 6 Pluses are out of stock. If they weren't in high demand they would be in stock still. Microsoft made a small amount of Surface Pro 3's and you can find them everywhere since the day of release. The truth will come out soon but I'm willing to bet the 6 Plus is in much higher demand than the smaller 6. A large screened iPhone is what the public wanted and the smaller 6 is just a little bigger than the 5S. Not enough difference.
I agree. The plus feels like a whole new experience compared to the 5s. While the 6 has a bigger screen than the 5s, it still feels like the 5s in a way. Definitely NOT the case with the plus.
I think many people are appreciating the bigger screen, myself included. My wife went from a plus to a 6 back to a plus. She said the bigger screen was so much nicer. I think after the initial shock of a much bigger iphone wears off, the plus will become a whole lot more popular. It already is.