Thanks for the answer and comments.
I would be very happy to be wrong on this subject and I hope your thoughts are correct. Because I feel like we have bought a very basic device for an e-book reader; the technology in this field is rapidly developing and our devices will be very old just a few months later; without new firmwares it's obvious that we'll have difficulties in the future especially about the drm formats.
Hoping to be wrong again
Regards.