Or will my current 3Mb connection forever be routed through the old system? (for spite?)
What other system could it be routed through? You have a choice, upgrade and pay a little more which will go towards the cost of putting the new infrastructure in place or stay where you are. Nothing is free.
I have no knowledge of telecoms distribution methods, but I'd assumed that fibre optic carried both telephone and broadband traffic, it just did so more efficiently and speedily.
Other utilities would not install a new pipeline, drainage or cables and keep the old one in place ~ it would surely become the new and preferred method of transporting all the particular service.
So do I understand that telecoms use copper and fibre optic in parallel and that the fibre is almost solely for broadband traffic?