On a physical layer, yes: ADSL runs over the same copper lines. But the upper layers are quite separated. Moving everyone to VoIP means less infrastructure needed, things working the same for fiber and ADSL customers, and higher speeds for ADSL (due to being able to use the frequency bands reserved for phone service for data too). This has been a general trend in countries that are using ADSL a lot, e.g. here in Germany plain analogue and ISDN service has been reduced more and more too.