Yes and no .. mostly no.
Some, who don't care much of anonymity and just don't want to show that in the papers from bank will indeed use bitcoin for that. And that's not a big number of people and it's only on short term, I'd say.
Bitcoin is not 100% anonymous and there are altcoins just behind the corner, promising full anonymity. I think that the future of porn and gambling is for that niche, not for bitcoin.
Don't be worried, bitcoin is not fully anonymous. Criminals with bitcoin were already caught, and it's early
I'd be much more worried about .. the other coins, since those can indeed help the criminals and that's a big issue.
Some, who don't care much of anonymity and just don't want to show that in the papers from bank will indeed use bitcoin for that. And that's not a big number of people and it's only on short term, I'd say.
Bitcoin is not 100% anonymous and there are altcoins just behind the corner, promising full anonymity. I think that the future of porn and gambling is for that niche, not for bitcoin.
but I'm worried bitcoin will be also the criminals' future. 
Don't be worried, bitcoin is not fully anonymous. Criminals with bitcoin were already caught, and it's early
I'd be much more worried about .. the other coins, since those can indeed help the criminals and that's a big issue.