A bit of an over-reaction imo,I’m most of the way there already,headed up from South Lincs so not a short journey either,and it’s been fine.
For one or two riders, a small group ride then maybe.
When there are hundreds of riders potentially travelling from across the UK, no way. The organisers are acting on the advice of the emergency services who are already stretched to the limit without needing to get ambulances/helicopters etc up to a forest simply cos hundreds of MTBers want to ride round it.
It’s just a bike ride. It can happen anytime. Just have a good weekend while you’re up there but do something else.