Last word I heard was that THSL are ceasing to install Acorn lights as 'they are no longer manufactured' and they are running out of supplies. Yes, one would have thought THSL would need enough of them to keep a production line running but that's what I was told last year by THSL. They were intending to only install an updated version of the Cobras and were hoping to use VERY few different models of pole and luminaire. While there probably are now too many minor variations in official streetlight style in Toronto (plus many more used by BIAs), moving to one or two models is clearly not acceptable! (Ther is a huge list in the City's Streetscape Manual.)
A group of concerned folk in St Lawrence (neighbourhood assn, BIA, Councillors) had been meeting with THSL pre-covid and at least seemed to get agreement that they would continue to replace fallen "short Victorians' with new ones but even that minor victory is certainly not 'for ever'. As noted above, THSL has a mandate to provide streetlighting to a certain standard and is paid to do so by the City. The City are not prepared to pay more and THSL cannot subsidise street lighting from their 'regulated income' from providing hydro.