First of all, their speed is nothing stellar. A fast boba to ability block DT from dispelling, a fast Chirrut will throw tenacity up, the it's still game over. Now once both Krennic and DT are zeta'd it gets tougher. But the Zaul, Palps, Speed Boba and Chaze team will still be able to negate DT and Krennic with Daze and shock.
I for one am glad. This isn't replacing the meta but adding to it. Battles are going to become more strategic.