Cup team owners send letter to NASCAR stating they want further discussions on making charters permanent beyond the 2024 season.
www.nbcsports.com
Games change with the times, and while there's certainly teams that would like to be in NASCAR, the number of them that can't afford a charter and which you could bet on having long, successful tenures is not going to generate a big long list.
Eliminating the charters at this point would be an existential risk to the business models of the teams and thus is essentially non-negotiable regardless of what the split resembles for NASCAR.
NASCAR just happened to be one of the last international, top flight racing series to not guarantee entry to a limited field of competitors. But it is inevitable due to costs, especially with ancillary revenue looking more like the late 80s than the late 90s.