  We present new HST imaging photometry for the site of the Type IIn supernova
(SN) 2009ip taken almost a decade after explosion. The optical source has
continued to fade steadily since the SN-like event in 2012. In the F606W
filter, which was also used to detect its luminous blue variable (LBV)
progenitor 13~yr before the SN, the source at the position of SN2009ip is now
1.2mag fainter than that quiescent progenitor. It is 6-7mag fainter than the
pre-SN outbursts in 2009--2011. This definitively rules out a prediction that
the source would return to its previous state after surviving the 2012 event.
Instead, the late-time fading matches expectations for a terminal explosion.
The source fades at a similar rate in all visual-wavelength filters without
significant color changes, therefore also ruling out the hypothesis of a
luminous dust-obscured survivor or transition to a hotter post-LBV survivor.
The late-time continuum with steady color and strong H$\alpha$ emission
detected in a narrow F657N filter are, however, entirely expected for ongoing
shock interaction with circumstellar material in a decade-old core-collapse SN.
Interestingly, the ultraviolet flux has stayed nearly constant since 2015,
supporting previous conjectures that the F275W light traces main-sequence OB
stars in an underlying young star cluster. We expect that the visual-wavelength
continuum will eventually level off, tracing this cluster light. Without any
additional outbursts, it seems prudent to consider the 2012 event as a terminal
SN explosion, and we discuss plausible scenarios.
