When will the Sims 4 become too taxing for average users pc? 29 packs currently...

I seriously doubt there will be 30 more packs by 2023. We are currently running at 4 per year, which works out to 7.5 years for 30. Also, there is every possibility that the issue rate will continue to drop as it has consistently since 2015. Just enough to maintain our addiction, not so much as to tax resources.