How long is a piece of string ?
Seriously, who knows. To put some information around the "what if's" for VM, there is a 10 year old thread still asking "when will VM start using IPv6"
I suspect no one really know the answer to the upstream and can only speculate.
As for the Hub 5 situation, I believe there was a shortage of all VM Hubs, and this is slowly being resolved. Again, will VM backtrack on 1Gb orders and give everyone a Hub 5? Your guess is as good as mine.
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