The failure of Lola in the late 90's has often been related with the F1 disaster.
But I wonder, After 2K Reynard `lost it` gradually but at that time they were also spreading their wealth thin. Reynard was participating in some endurance projects.
Still there was a lot of potential in the basic Reynards of 2K and 01. But the best of them deserved to be renamed into either Renske or Peynard instead
But I agree, the `Changes of Fortunes` for the British based Customer car builders in the 80's, 90's and the first half of the 00s if we allow us to look onto the CART&successors series, that makes up for an interesting situation to look at.
Back to the late 90's and early '00s, apart from the factor `Goodyear` I could also nominate another one: Mercedes-Ilmor loosing the plot.
As I understand that situation, Ilmor-Mercedes had Team Penske as its primary outlet and/or partners and the late 90's engines being given designs specs as recomanded and requested by what Team Penske needed for their last PC## designs. Don't forget, the PC##'s were designed with the Ilmor-Mercedes engines an integral part of the entire design. Reynard, Lola and Swift had to design cars that at least allowed some compromises in order to accomodate different engines to be used in the cars
But with hindsight Penske was pursuing a wrong concept, in addition to their troubles due to being committed to Goodyear. But it also meant that the remaining Mercedes teams got stuck with an engine that was designed primarily for Penske chassis but because of that something of a compromise for the other CART chassis.