I got a pocketbook era color as a birthday gift this year. Half a year has passed, and... I barely use it >__> I'm just personally more drawn to physical books. I like being able to hold them in my hands (i love the textures!), look at the covers and see how much of the story I've read so far by looking at where the bookmark is. However...
I like how lightweight it is as it makes it easier to carry around, I like that it has a backlight for when I'm in the mood to read before bed (I have a reading lamp but it got a really short battery life and I often forget I need to charge it), and I like being able to download
(pirate) 
books I wouldn't be able to get in a physical format anyway.
But even with all of that I still like walking around in bookstores and recently even started checking out books from a library as well. And I know for sure there are loads of people out there who feel similarly to me. So I don't think ereaders are going to replace physical books, ever.
No other kind of physical media ever went away when digital and more convenient options appeared, either, people still watch dvds and play games on cartridges, some even listen to music on vinyls. Digital and physical offer different experiences and can exist alongside each other :] (even if some companies nowadays are going fully digital. I saw people on youtube burn games from their steam library on disks. Made their own box art and everything... But I'm kinda getting off topic now.)