Is it not damaging for ps4 sales especially the pro to be talking about the ps5?

No.

it's necessary a successor with the right price and good games

Why not? Imo people will say oh ps5 coming why upgrade to the ps4 Pro. Or next year they might just say not buying ps4 at all. 

Nope, he is just saying PS4 will have a successor. That have been said as early as 2016.

Because of the library, why bothering buying a 400/500$ PS5 when you can have a 350$ 4K gaming with a huge library ? 

I doubt it would affect sales of the base model, but yeah I think this will knock a little bit off of Pro sales.  I really don't think many people are buying the Pro already though.  In the Japanese #'s it seems to be about 20-25% of weekly PS4 sales.  Outside of Japan I don't know the numbers, but I would suspect that percentage is even lower.  

Why are we still talking about smartphones? They're not affecting them. Sony have done better this gen than last gen when there were less smartphones.

Sony have broken their own records twice this year in game sales, whilst smartphone gaming has been at it's biggest. Jesus.

LivingMetal said:  Sony president on PS4 successor: “It’s necessary to have a next-generation hardware” Early indications reportedly claim future PlayStation is not a major departure. Sony president and CEO Kenichiro Yoshida has suggested that the company is planning the release of a next-generation PlayStation. “At this point, what I can say is it’s necessary to have a next-generation hardware,” Yoshida told Financial Times. He declined to formally name the future console “PlayStation 5.” Yoshida’s comments were in response to debate over how Sony should address the rising global smartphone games market and the shifting habits of consumers as it readies game studios and the global market for a PlayStation 4 successor. Financial Times relayed rumors within the industry that Sony might also be planning a tablet that would connect to multiple devices “as online streaming of games becomes more widespread and the company seeks to derive ever greater synergies between its games and movie divisions.” The publication also cited “people in the games publishing industry with knowledge of Sony’s plans for a future console” who said early indications were that the next-generation PlayStation might have a similar fundamental architecture to PlayStation 4 and not represent a major departure from the console. Back in April, several game development sources indicated that a PlayStation 5 would not release until 2020 at the earliest. https://gematsu.com/2018/10/sony-president-on-ps4-successor-its-necessary-to-have-a-next-generation-hardware At my rate, I don't see myself buying the new PlayStation less than three years after its release.

thank you Sony

Lads I'm talking about the uniformed less hard-core Gamer who might be thinking of getting a pro or a ps4. Obviously they won't directly pick this random quote up but if all the mainstream media picks this up and word spreads amongst the casually informed consumer they might be put off buying a ps4. Just a thought. Imo Sony would be better saying nothing to the media until they are ready to announce. Now maybe they want Microsoft to think they're coming sooner then they are. Possibly forcing ms to jump the gun too soon after the xbox x.