The demand for the older Road Ready and Powerhouse cabinets fell like a rock as soon as the market said no and hell no. There's almost no demand for 100+ pound cabinets these days, and with the higher quality lighter weight drivers that are available recently, there's really no reason for the average pro player. The Subway cabinets outperform the Powerhouse cabinets model for model. For those who want the old cabinets, they are available on the used market for less than it would cost us to build them.
There are 6 Subway models: 210, 410, 112, 212, 115 and 215.
Yeah, you are not remembering this right. The Subway cabinet replaced the Powerhouse cabinets in 2014-2015, a full 7 years before we were acquired by Gibson. In fact, the Gibson ownership of today wasn't even around ~5 years ago.
The number of 810's being sold throughout the industry is pretty small. I did design (the electo-acoustic part) a custom 810 for Rex Brown (Pantera) last year, it was a custom shop tour support model and I also designed a 412 for Justin Chancellor (Tool) in approximately the same sized package (but much closer to the Subway family design), also a custom shop tour support model. It's not that we can't produce them, but the demand is really small and from the arena touring market. Clearly size/weight aren't important but the specific look was.
Rex's current tour rig:
Justin's current tour rig, the 810 is a customized Road Ready, the 412 is close to 2x Subway 212's (not exactly, but the differences were for his specific application in the O/D signal path):