rip market value, rip csgo viewership and rip csgo
There isn't a really a TF2 gambling scene and yet there are TF2 items worth hundreds and thousands of dollars. The market valve of CSGO skins isn't going to go down, they weren't valuable because of the gambling, people were gambling with them because they were valuable.
Also I doubt this will put any sort of dent into the CSGO player base, there was probably only a very tiny percentage of CSGO players that did any sort of gambling.