How long will this lovely old nikau keep its head above the Ivy?

https://inaturalist.nz/observations/13169836
Mature trees have been observed to die AFTER a large amount of ivy cover was removed. Ivy stems have tiny roots throughout, grasping and appearing to penetrate the bark throughout the surface of the tree trunk, at least on some species like ti kouka.
How will this nikau fare, even if the ivy is ever killed?

And here is the oak tree on which the invasion was partially controlled in June 2018 with chemical herbicide:
https://inaturalist.nz/observations/13780972

Posted on July 30, 2018 10:18 AM by kaipatiki_naturewatch