They shouldn't make a JPOP game, at least for a while. From a business point of view they need to focus on the top 10 and also the rarest and most sought after machines.
If CGC actually ends up making 5-10 or more of these remakes I think TOTAN or TOM would be first. They made a ton of WCS and it can be found for 2k pretty easily. TOTAN and TOM could be dolled up with improvements that might even lure in current owners.