One implication is that you may not get a real IPv4 address anymore. So your cable/DSL connection will be behind a Carrier grade NAT ( https://en.wikipedia.org/

One implication is that you may not get a real IPv4 address anymore. So your cable/DSL connection will be behind a Carrier grade NAT ( https://en.wikipedia.org/wiki/Carrier-grade_NAT https://en.wikipedia.org/wiki/Carrier-grade_NAT ) which breaks applications and causes problems for your internet provider (technical complexity), for software developers (implementation of workarounds for CGNs) and for you, because you suffer the consequences. Also, more expensive IP addresses raise the barrier to entry for new competitiors, so your internet connection may get more expensive.