Moxxey raises some interesting points and while many of us will agree there's just as many that view it differently. Personally I wouldn't let go of a 7-55 (providing I could accommodate it) either. There are several active threads where I have commented on how much I love that set. In fact, I believe it still shows the best picture from all TVs across the whole range.
The 7-55 is an interesting TV really but a bit of a double edged sword purchase. As well as being a technological masterpiece, with looks, sound and build quality to match, it also requires a huge space to look right. Of course we all have our individual definitions of what 'looks right' but for me it means a place where it doesn't dominate and looks like any other piece of furniture in the room. My BV9 is slightly on the dominant side but in a way that still works. After I bought the 7-55 (before the BV9) I quickly realised how big it was and that was the only reason it had to go. The 7-6 speaker requires so much room whichever floor stand used.
I think the 7-55 is definitely for those with larger homes and certainly not for people living in flats where space is usually always an issue. It is also big enough to give you a cinematic experience which takes it beyond the realms of television. Yes, it is 55" (only) but that's just the screen of course, the rest of it has a much larger presence.
The BV11 is also an interesting television and I am not sure I would upgrade from that to an Avant either, but that's just me. The pictures from B&Os latest LCD/LED panels are so impressive to me generally. However, it is only the 7-55 that I have never seen a motion problem on, nor clouding come to that, and motion has always been the biggest upset for me. Once I spot it going on I am constantly distracted from my viewing experience.
As far as middle aged blokes go... well I think people generally get bored after a while and like to move on to something different. I guess that's consumerism for you. At 44 going on 45 my middle age days are starting to feel a little more distant! I feel much more content now with what I have and my plan will be to add to my system rather than change it. I bought my BL9s because I knew I would be buying more and would like it all to match. The TV will stay until it blows up! At that point I'll consider whatever is available at the time. My next purchases are likely to be audio systems and maybe explore wireless. I may also look at some BL5s we'll see. Point is, we are all different in what we like and what we want from our systems. I think its great fun swapping and changing things around and used to do it a lot in my 30s especially, its only very recently that I have started to settle a bit!
Have a good day all... and ENJOY your B&O, whatever it is!