* Jørgen Hovland:
1. No PI. _Only_ network operators get a prefix. 2. Customers of network operators can at any time change provider and take their assigned prefix with them. The new provider will announce it as a more specific overriding the aggregate. If the customer decides to get multiple providers, then the network operator with the /32 could also announce a more specific.
This would imply that you cannot filter the routing table at prefix lengths less than /48. What's worse, outage of an ISP routes traffic to a now-unrelated ISP, which must discard traffic at its own cost. Better get rid of the aggregates. 8-/
In the country I live in I can change telecom provider and take my phone number with me to the new provider. Why shouldn't I be able to do that with internet providers?
PSTN routing is completely different. In Germany, routing is mostly static AFAIK, and there is no expectation that you can reach all phone numbers from every phone (and it doesn't work in some cases).