Bharat, you wont be able to support any new services after this migration. As mentioned its only a best practise what you would be implementing to avoid possible (likely or unlikey :-)) issues when you provide services like
1) Inter-AS MPLS VPN;s
2) IPV4 External Peering with other AS's.
So with or without the migration you will be providing all the service what you provide today. Its just a way to keep things clean.
Also as a rule of thumb, you can keep all your infra IP's private and only loopbacks public(which should help achieve in the lines of the bestpractise and also conserve space).
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