If your VCP certification does expire, it would be like you never gained it in the first place:
- You would have to meet the regular training requirement for any VCP certification you wanted to obtain.
- You would not be able to obtain a higher-level VCAP/VCIX certification without first getting a new VCP certification.
- If you did gain a new VCP certification, your expired VCPs do not become "un-expired" - they would not show as current on your certification transcript.
Remember, you have 2 years from the date that you gained your VCP certification before it expires, and you can recertify by passing a VCP exam or achieving a higher-level certification.
You can view your transcript and expiry dates at any time by logging into your VMware Certification account and clicking the myTranscript link.