cyberpunk will definitely sell better than Witcher 3.
1. the overall quality will be better. this is their 4th major video game (not counting witcher adventure or gwent). each witcher game was a huge improvement upon the last. cyberpunk will be on a whole other level compared to Witcher 3.
2. it has a wider appeal. i've seen a lot of people not wanting to play witcher because it's not got guns, cars, you ride horses, it's set in a medieval like setting, has magic, witches, and monsters. cyberpunk is the opposite pretty much. guns, cars, set in the future, no magic. a futuristic dystopian setting is gonna really help.
3. will be a much deeper RPG than witcher. it's of course based on a pen & paper rpg whereas witcher is just based on a series of books. cyberpunk has way more freedom. yes there will be characters that will have been in the p&p rpg but it's an RPG. you can be anyone you want. in witcher you had to be geralt.
4. it will have an 80's feel to it. sure it's set in 2077 but cyberpunk as a genre is heavily influenced by the 80's.
5. it'll be releasing in 2020 which is looking to be the last year for the current gen of consoles. more people will own a ps4 or xbox one in 2020 compared to 2015 which is closer to the start than the end of this generation. also it's likely it'll be updated for next gen.
6. keanu. not many video games have major celebrities. off the top of my head the only other upcoming game that has celebrities would be Death Stranding. Keanu is in a whole other league compared to the likes of Mads Mikkelsen, Norman Reedus, Guillermo Del Toro, and Léa Seydoux.
Meanwhile, Mike Pondsmith, an actual black person and creator of Cyberpunk, has seen the demo beforehand and approved of it.
he's obviously oppressing himself!