Sorry Dean, I don't agree with you.
You guys are trying to tell people how to run their networks, and that they aren't allowed to pre-emptively design their connectivity to allow for changing to multi-homing, or away from it, without going through a change in network configuration.
That might be easy for you, but that is simply your opinion on how things should be done... not a reason why others shouldn't be allowed to do it the way they want to.
If a member has a portable range, they should be entitled to - with no restrictions - a ASN number to be able to BE as portable as they want to.