-The eleventh doctor being the end of The Doctor we've known for 50 years and Capaldi starting a whole new Doctor with fresh set of regeneration
That one's probably true, mind you.
The new set of regenerations, I can totally see happening and is totally fine. Although I did like fan ideas where the uncertainty of how many regenerations are left could increase the drama and meaning of each one.
But it sounds more like the theory is that one character is ending and another is start who assumes the same name and identity. I wouldn't want that.