Not if the people he calls have to do something new. DNS blocks are easy. Weathering an active attack might be harder. The question is how far Twitter wants to escalate.
If people keep pushing it with VPNs and censorship avoidance they'll just push Turkey to switch to a whitelisted Turkey-approved Internet and block everything else by default. It's much easier to maintain a whitelist of approved sites when you're censoring people than try to play whack-a-mole and block things that you don't like.