Thats great, we can still ride butt, no logging, mining or oil and gas. Most of the west will go out of work, just a few ranchers and tourist wathing wolves left anyway.
Even the act of nominating an area to become wilderness makes it a defacto wilderness until congress votes on it It is called "wilderness study area". The trick is that no congress ever wants to vote"against wilderness" so they never vote on the area and it stays "wilderness study area" forever
in 2002 there was a bill in congress that if an area was nominated wilderness but not voted on for 10 years it went off the "wilderness study area" list. this did not pass.
There are many like that. There is a Wilderness study area like that here in wyoming and many all over. The "fortification creek wilderness study area" was nominated in in the mid 1980's it is completely land locked by private land, there is no way possible for the public to access the area. In 1987 the BLM itself recommended to congress that the area not be made wilderness because it did not meet the criterea. Yet to this day it is still designeated "wilderness study area" because congress never voted on it up or down.
If it gets designated as wilderness, there will be no such thing as "we can still ride butt". Or I should clarify and state "we can still ride butt illegally".
Regarding Wilderness Study Areas, requesting that a certain area become a wilderness area through a bill (that has not yet passed in Congress does NOT automatically make it a WSA. They would need to pass a bill that asks the Forest Service or BLM to study a certain area for inclusion in the wilderness preservation system and report back to Congress. If the WSA bill passed Congress, then in some cases yes, they are designated as WSA and in many cases treated as defacto wilderness for many, many years. Not all WSA are treated as wilderness. We are still allowed (for now) to snowmobile in the I-90 Wilderness Study area here in WA State around Lake Ann and Vann Epps Pass.
And the third scenario is that the Forest Service (or BLM) does a Forest Plan Revision and determines that certain areas should become Recommended Wilderness Areas. These RWAs in some regions (R1 - MT) are treated as defacto wilderness and closed to mechanical means of transports (Mtn bikes included), until they may some day be designated as wilderness through Congress. Other regions (R6 - WA and OR), RWAs are still open for many forms of mechanical use (at least for now).
The FS and BLM can not designate any area as wilderness, but they can sure lock an area up and manage it exactly as if it were wilderness as you state, but not quite how you indicated.