Planned Tony Hawk Pro Skater 3 + 4 remasters were cancelled after developer merger

gamesradar.com:

Remasters of Tony Hawk's Pro Skater 3 + 4 were planned but scrapped after the series' developer was merged with Blizzard. 

With the success of the remastered Tony Hawk's Pro Skater 1 + 2, the same virtual nip and tuck treatment seemed likely for the skateboarding series' third and fourth entries. But, sadly, this never happened. Now it's been revealed that remasters of Tony Hawks Pro Skater 3 + 4 were in the works, but the project was abandoned when Activision decided to merge Vicarious Visions with Blizzard. 

This comes from none other than the skateboarding legend himself, who revealed the news yesterday during a Twitch livestream with Andy Gentile. "That was the plan, even up until the release day of [Tony Hawk's Pro Skater 1 + 2], we were going 3 + 4," explained Hawk. "And then Vicarious got kind of absorbed, and then they were looking for other developers, and then it was over."

Tony Hawk's Pro Skater 3 + 4 remasters were in the works but they were scrapped after Vicarious Visions was merged into Blizzard.