According to the people who actually played with post-nerf thralls and tested the purge, there will be more risk than before, but it should be manageable.
Here’s a post by @darthphysicist, who was kind enough to share his experiences from closed beta test of the Age of Sorcery:
Here’s a post by @Ricojes, who went into TestLive and did some concrete testing and then described those tests and their results in detail:
It looks like purges will be riskier than before, but perfectly manageable provided that you adapt your tactics.
Also, bear in mind that these posts only talk about thralls. With the Age of Sorcery, we’ll have more tools in our toolbox, such as resurrected corpses, which seem to be quite powerful: