here's a good report out of NZ about re-opening a national park trail to bikes on a seasonal basis over a 3 year trial period….yet again, the sky did not fall….
http://www.groundeffect.co.nz/files/slushfund/docs/49-2079593646.pdf
please be sure to send in your comments on the draft amendment, I'm working trying to piece together a response and I think one of the salient points at this juncture is that they've contradicted themselves quite a bit with their rationale for accepting huts/helis but continuing the ban on bikes.
Further, I think the amendment should at the very least leave the door open for the possibility of it happening in the future, or at least discussing/planning solutions in advance of at least a trial period. By keeping the status quo at this point they are locking us out for the foreseeable future. They seem to admit that with adequate management solutions and trail upgrades most, if not all, of the concerns could be relatively easily mitigated. But they appear to not even want to leave that possibility open and sit down with a group like worca to come up with a good management plan, and to leverage the experience of the group for trail work and fund raising.
The status quo has proven to be unacceptable, but it's the easy way out here, BC Parks apparently doesn't want to put in any effort and think that by maintaining a prohibition that things will magically be awesome.