Ok, back from some bird hunting.....so I was the original poster on this thread. My background is both western state education and a career in natural resource management....final decade of career as responsible for 330,000 acres of public land. Fairly familiar with forest management issues, fiscal reality and experience with prescribed and wildfire.
Most of the Roadless Areas are in the West, and mostly are in fire dependent ecosystems. Using wildfire suppression and timber supply as reasons to remove Roadless Area designation have a few weaknesses. First, the remaining Roadless areas generally are the most undesirable to log.....that's why they weren't logged previously. The best timber on the easiest lands were logged long ago. Generally steep, rocky and/or poor timber quality. Second, roading these areas is expensive...a GAO 1977 report put average logging road at $19,000 per mile...inflation from 1977 to 2025 is 435% so approximately $80,000 per mile in 2025. And they require maintenance....the USFS has a 8 billion dollar backlog in maintaining the 368,000 miles of USFS road. Third, these fire dependent ecosystems needs fire to be healthy. Beetle killed downfall are not viable as lumber, are now often several feet deep and lack of seral vegetation and openings are not favorable to many wildlife species. Suppressing fires just builds more fuel so fires are hotter and larger when they do burn....and they will burn. Prescribed fires can be successful at a small scale, but are very expensive and take a lot of manpower, have narrow timing windows, incur risk, and can generate smoke that many Westerners find undesirable. They are best in light fuels and most appropriate in wildland urban interface....not backcountry Roadless areas.
So in western Montana where I live, most timber mills have shut down. It would take over $10,000,000 to establish a new mill. A prudent investor wouldn't invest that kind of money without an assured timber supply and a steady demand with a cost competitive supply. Frankly, the best western Montana timber was logged long ago. Today West Coast second growth timber and timber in the South is much more competitive costwise.
The remaining mills I am familiar with are not starving for supply of trees.....but have higher labor costs, housing issues and a competitive market. BTW, the average cost framing wood of a new house is 6.5 to 8% of the total cost of the house. So a bit cheaper wood wouldn't do a lot to lower housing costs.
As others have mentioned, reducing staff and funding of natural resource agencies is contrary to increasing wood supply or land management in general. Creation of the National Fire Service (led by Sen Tim Sheehy) and taking the fire budget will further deplete natural resource agencies. Many resource employees were/are partially funded by thier time in fire related activities.