Game of Thrones was never just another period, fantasy drama. It was long, bloody, twisted, and despite a less-than-awesome last season, one of the most well-loved TV shows. 

Arya Stark
Source: Forbes

However, George R.R. Martin recently revealed how the TV series negatively affected him as a writer.  

George Martin
Source: CBR

Like fans of the show and the books would know, George R.R. Martin is yet to release Winds of Winter. In fact, fans--disappointed by the way the series ended-- are actually looking forward to the 'original ending' that Martin envisioned. But it appears that we wouldn't be treated to that ending for a long time because rather than helping him, the series actually slowed him as a writer. 

I don’t think the TV series was very good for me. The very thing that should have speeded me up actually slowed me down. Every day I sat down to write and even if I had a good day … I’d feel terrible because I’d be thinking,‘My God, I have to finish the book. I’ve only written four pages when I should have written 40'. 
George Martin Game of Thrones
Source: HT

It's no secret that the creators got a lot of flak for the series finale. However, Martin is unaffected by the criticism and still believes in the ending he originally thought of. And for him, his 'creative satisfaction' - and not the fan theories or the criticism - is the only driving force for his work. 

It (the criticism) doesn’t change anything at all … You can’t please everybody, so you’ve got to please yourself. Some (the theories) are right and some are wrong. They’ll find out when I finish.
George David
Source: Zimbio

Well, we may be in for a long wait to see, or rather, read the actual ending but if there is one thing the GoT fans have in spades, it's patience.