It’s a tough predicament.
CLECs (AT&T, Verizon, et.al.) have a bunch of rules they have to follow that were made at a time when they held a different position. And let’s be honest: holding them to a standard that took into account a position they no longer hold really isn’t fair.
On the other hand: there are a significant number of people who still use CLECs in the same way they used them once upon a time, and dinosaur references notwithstanding it really isn’t fair to just cut them off.
On the OTHER other hand: the elimination of analog TV broadcasts was a similar issue when viewed from that last perspective, and the solution was simple: offer a converter box, and even subsidize it.
So maybe the solution is to provide a DSL converter free to anyone who asks for it, thereby dragging them into the digital age without really making them change anything. It would be a simple matter to augment that device with a very cheap router with telephone IP capabilities built in.
Your business change issues can be solved the same way; all you need to do is think. Or hire someone to think for you.