I'm not sure that re-enabling HT as the sole counter measure to Zen 2 would be sending the right message about Intel's position. It'd be an admission that they had reached the end point of 14nm+++++++++++, and that they definitely were well behind in their development of 10nm.
Why would they need an 'admission' on that though? Anybody with any industry experience would know Intel has been milking 14nm for way longer than planned. They would also know that is a direct cause of the 10nm delays. Enabling HT as a 'last hurrah' for 14nm seems the most logical thing to do to stay relevant in the performance race.
What else would you suggest? For Intel to do nothing and idly sit by waiting for 10nm while AMD catches up on frequency and IPC *plus* offering twice the threads for a lower price?
HT easily enables a +25% uplift in MT performance and it's basically a 'free' upgrade for Intel to properly compete with Zen 2.
I don't see how else they could possibly compete with Zen 2, it would be a complete market domination by AMD otherwise.