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Estorils changes I am not sure were done for bike racing, it was changed in the early 90's for F1 as there was a barrier on the outside of the track near the end of the lap with a huge drop on the outside and they couldn't do much about it. Bit like Tamburello, but even worse.
Don't think it was anything to do with bike racing, as MotoGP did not really start going there until I think 1999. Superbikes raced there before then, but raced on a slightly different layout anyway.
Assen is far too short to be an F1 track, and they don't have a massive sponsor to push it through anyway like Austria do. Zandovoort would be great but I doubt the people owning it have the money to invest in the necessary improvements.
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