Passionate bunch aren't we? Going back to the original question, I'll say again that linkage is not vintage.
But I think that vintage in this sense is not the concept of a rolling date (ie 25 years ago or whatever). Of course eventually bikes like the first YZ400 4-stroke become 'vintage' to someone but that's only in the sense it's an old bike. To me, the original vintage motocross as pushed by guys like Firko celebrates a specific era in the evolution of the dirtbike scene. It's about what happened in the 60s and 70s which is a very distinct era. It's like say the Hippy phenomenon. Sure there are hippies now, but the flower power generation was a particular period in time.
So, true vintage MX is about twin shock bikes from Pre 78 (speaking of which, how's that register going, Mark?). It's about celebrating a very specific time, and that should never change. Vintage in that sense must be kept pure and venerated for what it is. Maybe in the years to come younger guys join in as the older ones stop riding or take up lawn bowls and veging in the sun. And maybe not.
As the years pass, of course new guys will want to celebrate their youth and join the fold, and YZF400s will become the tool of choice. But that doesn't mean that suddenly the spirit of true vintage has been lost.
And note I am not arguing about what classes to have now or next week. I am arguing that true vintage is twin shocked, drum braked, air cooled bikes and a celebration of a time in history. And linkage is not vintage.
However, there must be some way to preserve that concept AND still embrace and encourage the introduction of new classes. Given the notion of a rolling timeframe, we have to accept that 1988 is 20 years ago, and that means that riders of those bikes are near or into their 40s, an age when all of a sudden the old rosy glasses thing leads them to want to go out and buy the old bike they used to ride and go flog it round a paddock with a few other old farts instead of ageing gracefully and putting some more garden gnomes in the front yard.
Why should these guys be forced to have to ride what older blokes think is OK? It's OK for Firko and me, VMX does embrace the bikes we rode as yoofs. But what about Johnny X who used to race a 1989 CR250 and who now at the age of 39 wants to go get one and race it with a few mates? Is he forced to wait until eventually all of us cark it and then he can do something? Bollocks.
It's my argument, once we start talking classes, that we need to preserve true vintage, but also allow for the effect of the 20 or 25 year rule. That is, every so often, we should open up to include later models. And I personally think that Pre 90 is coming. Even if that means supporting it as a separate concept, like my earlier thread about 80s MX. Or just call it, as Nathan suggested, Satan's MX...