there is no new hub sent automatically now unlike it used to be many years ago. now you only get a new hub if existing fails or you upgrade to a package where a new hub is required
Basically the philosophy ' if it ain't broke don't fix it' is the way to go
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Hubs are not periodically replaced, they are only replaced when technology dictates a different version of hub is required or if they go faulty. You might be able to negotiate a replacement hub at contract renewal, but as you have said, if it ain't broke why fix it.