I think there’s probably room for a dLive XL MixRack. I also think it probably wouldn’t be hard to let the existing surfaces connect to both kinds (although you’d have to get real creative to access all those channels and busses on a C1500 or S3000).
Maybe add a 4-bank surface to the lineup, too.
Speaking of which, it’d be a great opportunity to offer a “V2” of the surfaces, too. I’m sure by now A&H has accumulated enough feedback that there are things they’d change if they could.