Yes for games, those old game you most likely won't play again, but some games you can keep playing. I'm not talking about action/adventure game, I'm talking about games like words, puzzles, etc. It's more likely a person may still play it, when switch platform, all these purchases, they need to re-purchase on the new platform.
Apps and Widgets/Launcher (on Androids) are more value and it maybe costly purchase. All gone.
Anyway, the key point here is, for Nokia-Microsoft to understand the IMPORTANCE to GRAB the customer before they 'switch' to another.
When they LOST the customer, it's HARDER to get them back.
You have to think not as a customer, but as a company which needs to capture back the market and get back into the game. As you said, once a customer change phone, it can be years before they change again, by the time they change, it's MORE challenging to make people 'switch' that time compare to the time when they are deciding to switch from an obsolete/old platform (e.g. Symbian --> other platform).
Nokia was once World No. 1. How did Samseng rise suddenly and in such short time? Did they come up with something good? Where did the customers come from suddenly and so many?
Well, most of them are from Nokia, Symbian users. Those Nokia Symbian users, most of them already decided to SWITCH, this is the important time for Nokia to MAINTAIN their customers by offering a good alternative, but they failed to do so. Now the customers left and have 'bad' impression with Nokia, it's harder for them to go back to Nokia.
Anyway, this is going off topic, lolx.
Just my personal opinion that this Lumia 1020 spiked MANY interest from others, but they should've priced it competitively to quickly capture the market.
E.g. If people go for Z1, especially those people 'switch' from older/obsolete devices (e.g. Symbian), this is the key time to capture these customers because many customers, once they switch new platform, they might stay there.
And more importantly, to ensure PureView predecessor, the Nokia 808 PureView customers, to STAY with Nokia. These are Symbian users, that maybe looking for replacement for their 808 PureView. Will Nokia loose MORE of their Customers?
If you actually compare in details, no match/comparison at all with DSLR.
But it's a phone with great camera and always with you, and the lossless zoom or >30MP file is really something.
BUT, just to highlight, from 808 PureView experience usage compared with other Smartphone camera, it's not ALL GOOD, there're some drawback/weakness...
Firstly, bigger sensor also means more shallow DOF, and you can get more errors of out-of-focus shots especially for close-ups. Thought this is not actually a weakness more of user's understanding.
For weakness, it's more on the usage, comparing 808 PureView with other samrtphone camera, it's slower, auto-focus problems (hard to lock on) and seems to prefer slow shutter speed (auto mode users take note) which is a problem when taking moving subjects.
testing in progress.