The regulations have nothing to do with the older chassis maintaining some form of competitiveness. TKM still has adjustable torsion bars, they just have to be welded in place; it still has caster/camber adjustment, you just have to use different stubs; both far more expensive ways than simply allowing the adjustment to begin with.
The relative low cost of TKM in the chassis department has already gone because there is no longer a cap on chassis prices. The only way it is now cheaper than Rotax is in engine maintenance and even that is becoming less so now that Rotax seem to have sorted many of the early reliability problems.
TKM was the biggest (and best) class in the UK for a long time. However, times changed and TKM didn't. Apparently, people didn't want what they were offering anymore, rightly or wrongly.
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