Will there be an iphone 6 and 7 (etc)?

Will they just keep going until the iPhone 384 or whatever? And will they be the same size as the iphone 5 or 4? Because what if someone wants to buy a case but then the new iphone comes out and they buy that one and it's in a different size? That case will never be used again… Sigh i wish they'd keep the size and shape the same. But will there be more iPhones?

Added (1). Yes what annoys me is they keep making it taller… I don't think it looks good:/ And all those skins and cases from your old iphones go to waste… Ugh.

It'll go until they have nothing new to put in it. Which might be from 3-300 years away

There will be upgrades to the iPhone and Apple will update it as long as there's a demand. Will there be an iPhone 6? Definitely.

Of course, just the name might be changed. Like it went form ipad 2 to "The new iPad/The iPad with retina display)

There will and they'll keep numbering them like that and they will keep getting taller without getting wider. Apple is a fail fanboy company.

I sure hope so, I want to see it constantly improving.

YES, of course.
and it is said that the next iPhone is iPhone 5S.