Bicycles to be allowed in the Wilderness?!

I can't agree with the idea that there are no existing wilderness areas compatible with XC biking

I can. There are no existing wilderness areas where cross-country biking should be allowed. Have you seen what dirt bikers do to the desert? A mountain bike is just a low powered dirt bike.

Gary, are you cool with aggressively cleaning cliffs(using crowbars, wire brushes and removing vegetation that might be threatened and endangered(because cliff-life can be fragile and really frikkin rare) or be the resource of other cliff-life)) so that folks can climb it? Is cool with you to remove or disturb nesting birds such as peregrines and others so that folks can climb it?

encouraging the pent-up weekend warrior to take advantage of their tax dollars and get out there and tear sh!t up.

The ATVers already to a great job of tearing sh!t up. Do we need more?

Not once did I ever see a mountain biker ever slow down when passing pedestrians on the trail, nor did they even move off the narrow trail to minimize the risk of collision with pedestrians.

It’s complicated. When the 1964 Wilderness Act was signed, it stipulated that "there shall be no temporary road, no use of motor vehicles, motorized equipment or motorboats, no landing of aircraft, no other form of mechanical transport..." At the time, mountain biking as we know it didn’t exist and mechanical transport was defined to mean a cart, sled, or any other vehicle "powered by a non-living power source.” As the sport began to emerge, the Forest Service updated its rules, with the most influential change coming in 1984, when the agency banned the "possessing or using a hang glider or bicycle.” Note, however, that wheelbarrows did exist in 1964.

.And Why You Might Not Want To
Not everyone has such a favorable view of the legislation. There are fears that the bill could create a rift between cyclists and the environmental movement with the inadvertent effect of empowering pro-extraction interests. Outside’s Grayson Schaffer raised this concern last April when 275,000 acres among the Boulder and White Cloud Mountains were signed into federal wilderness:
Most dangerous of all is that the fragile coalition of recreation interests that’s critical to wilderness advocacy will have to spend time and political capital shoring up its own ranks instead of actually fighting for conservation. If hikers and bikers are at each other’s throats, the only interest group that will benefit is the one that would prefer extraction and development.

(3) REQUIREMENT.—In making a determination pursuant to this section, a local official shall seek to accommodate all forms of nonmotorized transportation, to the maximum extent practicable.

I just recently completed the JMT (just to prove I can hike too ;) and have always mountain bike'd. I fully support a case by case assessment by the land manager. I wouldn't want to see MTBs on the JMT, but some stretches of the PCT I have hiked were just begging for mountain bikes!

Blanket policies misinterpreted to a ridiculous standard, mechanical doesn't mean human powered IMO, are not a good policy. Let's use our brains peoples!