I think it depends.
You began your question by asking about an increase in activity in the Arctic. I think most of that activity is not something that calls for an armed coast guard. It's mostly about keeping track of what is actually there, and trying to figure out when there's something that's not quite right there, and being able to respond to that.
The first challenge is going to be the surveillance part and being able to communicate among the different participants in that information collecting process. The second part is going to be being physically capable of responding appropriately.
I don't know enough about the legal questions that are involved in setting out the mandate for the coast guard to be able to comment on whether that's a good idea or not, but certainly there will be some times when appropriate responses in the north call for some kind of armed police force. Whether that's the RCMP or some other agency, I can't say.