When I googe "24x8 cable modem" the bulk of the hits are for Hitron so it looks like they have a big lead in this market. There is a story about the SMC Veloxite D3G2408W from CES a couple of weeks ago. There is a link which mentions that some of Cisco's software can support 24x8 but I don't see a link to actual hardware products. And I don't find anything when googling for Motorola 24x8.
So unless this Hitron issue is resolved soon it doesn't look like there are a ton of options for Rogers to switch to.