For anything on BC Parks land, you have a real problem. But here are a few comments:
1. Try asking for a morritorium (ie a freeze) on all further construction on the trail first, to allow morew time to discuss and search for alternatives, instead of removal of all structures.
2. NSMBA was successful in obtaining permission and even asistance from BC Parks to construct a "multi-use" trail at the bottom of Seymour, and which then allowed us to keep open a technical MTB trail (Empress). However, this was mainly due to the elimination of another connecting trail that was eliminated by a housing development, which resulted in excessive MTB traffic on a primary hiking trail (and riding route up), Old Buck, and which created safety issues.
3. The above was also only possible due to the excellent relationship that had been developed between NSMBA and BC Parks and District of North Vancouver from years of hard work.
4. BC Parks has indicated to us that there is considerable pressure in and around many BC Parks from increased MTB and other users, and that there probably just are not the resources available to allow some of the "experimental or first time" projects that we were lucky enough to be involved in. ie.. Parks has standards that must be met, they have drastically cut-back or reduced budgets (thanks to youyr friendly federal Liberal Govt) and they simply don't have the time or inclination to be bothered to deal with these type of issues.
5. Get the backing of other local landowners (city, district, private etc) through direct communications by intelligent people presenting balanced approaches. Lots of work.
6. Remind people, calmly and in the right way, that MTB is here to stay as a mainstream recreational sport and you want to work with them to satisfy all recreational outdoor users needs. If they just rip down well built stunts, some people will simply and quickly go back out and build new trails and more stunts, but probably just disposable junk. This leads to even greater risk of injury, more continued illegal trail buuiding and constant confontation. There is no way they can police all the forests, so finding some mutually acceptable solution will eventually be the result anyway. Your aim is to work with the landowners, not in confrontation with them.
Gotta go. Hope this helps a little.
Ciao…PD
Life should not be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming "Woo Hoo - What a ride!!"