Azuras 2013 world cruise cancelled.

Lets face it who didn't see this coming? A world cruise on a ship this big was always going to be a mistake.
I'm going to generalise a little bit here but the average age of a world cruiser tends to be sixty five plus, (who else but someone that's retired can cruise for a hundred days or more?).
Older cruisers tend to prefer smaller ships, (see, I said I'd be generalising), and P&O have designated the Azura as their largest 'family friendly' ship.
A cancelled cruise was always on the cards.

Which do you prefer...........?

I was chatting with a past passenger of mine last week who happened to be looking at a 36 night cruise. We had a bit of a laugh and a joke about how jealous of her I was as I've always wanted to book a really long cruise. Not necessarily a world cruise but something like cruising to the Caribbean and back from Southampton, about a month or so long.
I've never done it though as I just can't afford to take that long off work or spend that long away from home; but it did get me thinking about which option is better, one really long cruise a year or two or three short ones? (Obviously the best option would be two or three long cruises but you'd need a lot of money for that)!

How big can they really get?

Several customers of mine have just come back from the Oasis of the Seas, and yes I was very jealous, as I can’t wait to get out and see this ship for myself. For those of you don’t know she’s enormous, the biggest cruise ship currently at sea. Speaking to one woman she told me she couldn’t believe how big it was and couldn’t imagine anything bigger.

Which got me thinking;
How big can they go?
Is there anything that limits their size?
Are there plans for anything bigger?
And most importantly do people want bigger? (Yes, yes, yes from me, I love huge cruise ships).