No, you can have a silver account, you don't need to be Gold.
They have spoken about deleting old inactive accounts, but this is only for accounts that haven't been used since the Original Xbox, so not Xbox 360 active accounts whether they be Gold or Silver.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.
How satisfied are you with this response?
Thanks for your feedback.