There is no evidence that THC caps are being considered in federal legislation. I broke the story about this report, and it’s totally unrelated from the rewrite Booker, Schumer and Wyden are doing on the MORE Act right now. The report recommends that federal agencies research THC potency and decide if they want to recommend that states create THC caps. (See: Florida, Vermont which have or are considering caps) This headline is clickbait and misleading, JFYI.
Never say never with lawmakers, but it is not something they are working right now in terms of federal legislation.