At some point the v4 compatibility feature is not going to be attractive to significant nr of people. Just like parallel ports in PCs ceased to be. So yes there

At some point the v4 compatibility feature is not going to be attractive to significant nr of people. Just like parallel ports in PCs ceased to be. So yes there's a force favouring legacy support, but it's only so strong, and prone to weakening. The transition will take a while because of old devices, I agree with that. But still doesn't change the prospect that v4 will go away eventually.