I'm not "bailing" for the iPhone 6, but I could see myself carrying my 1520 AND an iPhone 6 Plus!
No, I'd never "leave" Windows Phone for another platform now, but I don't see why someone couldn't have both. The best of both worlds! Why? Because I can! That, and I'd have access to all those apps that I've been missing (I came to WP after being an iPhone owner for 4 generations - I had the original iPhone, the 3G, the 4, and the 4S) then switched to WP8 when it and the Nokia Lumia 920 came out... Been here ever since! Upgraded to a 1020, and now a 1520 and LOVE this phone! I'll definitely be keeping my 1520 on this line until MS decides to release a real flagship successor. Until then though, no reason why I couldn't get the iPhone 6 Plus on my other line and have both!
Or not.... maybe I'll just wait a little longer... and wait some more.. Come on Microsoft, we're waiting!!!!