Frankly trying to secure land in Los Angeles for a new arena would be a nightmare, so it’d likely end up in a suburb near Los Angeles rather than LA proper like how SoFi Stadium is in Inglewood.  The even more difficult thing is securing funding.  SoFi Stadium was funded without any money from LA County, which was only possible since the Rams’ owner Stan Kroenke only had the wealth possible to do so by being married to a Walmart heiress.  Unless the Panthers’ owner has access to similar wealth, public funding will be necessary.  This leads to the further problem of negotiating what the owner will fund in return such as an entertainment square or other development which will completely destroy traffic in the surrounding area unless proper public transport is in place.  In short, I’d think it would be much easier to try and secure use of Staples Center (not calling it by it’s new name).