As of now? No. No ISP is bonding more then 4 channels outside beta testing. Eventually they will start to, its not going to be something where they flick a switch and all of a sudden your getting 8 channels. Each ISP decides how many channels are needed, or capable of, for each market, or each area, or each node. This wil depend on maxium usage, adverage usages, number of users, distance covered, and capability of the infructure. As you open the channels, your opening the band for possible ingress to leak in, and Its very important that they control that or D3 connectivity issues will be the norm. Already they are the number one complaint for power users on most ISP forums.
So yea, 6180 is a more capable modem, but pointless as of now. Maybe in another year or so.