No, full version (whichever it is) continues to work indefinitely. Only problem is if you found bugs that affects you and you can't access support or newer version with this (or those) bug(s) solved.
From my experience, developers are very quick to solve reported bugs and you have one year support upon purchase, so you could say you're pretty safe in having working wiki version on your site, even if you don't ever plan on purchasing additional years of support.
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