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2801 ISR w/ HWIC-CABLE-D-2 .. DOCSIS 3 migration?

We have an ISR 2801 with a HWIC-CABLE-D-2. Within 6 months we expect a DOCSIS 3 rollout to our area.

Is there any hope for a HWIC-CABLE-D-3 or another DOCSIS 3 compatible HWIC?

It would be even better if it was compatible with the ISR 2801.

I  can't find any information on this except for a note stating that the  HWIC-CABLE-D-2 will not be "upgraded" to be DOCSIS 3 compatible due

to  the hardware not supporting channel-bonding. I assume this means a new  HWIC would be needed, and not just an IOS upgrade (which is fine);

but does that imply a DOCSIS 3 HWIC will exist?

I know there are backbone devices that are DOCSIS 3 compatible, unfortunately they are not an option due to cost.

If we had to use an external DOCSIS 3 modem, and then use a short ethernet link to the 2801, what would be the downside?

I have a blind assumption that it would be a large performance hit to the router.

I know the DOCSIS protocol allows the ISP to have (in my opinion) strange restrictions and control over the modem.

Would we be able to route 3 IPs through the external modem like we are now?


Any information or even educated guesses on this front is very appreciated.

Thanks!

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