Timber price is going up around the world. Years back there was also a big disruption to OSB board production, due to big fires in North America. However... OSB board is simply much more efficient use of timber and has therefor been quite stable and reliable source of building material.
Common misconception about SIPs is how much timber is required to assemble the panels together. When we get excited about the SIPs in general, often we want to push SIPs further and ideally not use solid timber at all, but it doesn't work this way, there is still some timber in assembly of SIP panels. But you can be clever in how you use SIPs to minimise use of solid timber.
In principal we often specify studs @600mm crs when we design with timber frames; top&bottom plate, maybe a double top plate when we have larger rooms and need a diaphragm, and the never ending discussion about why do we actually need those dwangs/nogs etc... But it appears that the times of studs @600 are long gone, and with more wind and seismic issues, more adventures designs, taller walls, bigger rooms and large openings, we have more and more t