I don't totally rule it out, because it is possible. It's also possible Kroenke decides to invest all his money on the research and development of interstellar travel. Simply due to the fact he's capable of doing that, it's within the realm of possibility.
However I haven't seen anything that makes that likely, just as I haven't seen anything that makes the sale of the Rams likely. I've seen some ideas from local beat writers about this happening, but just that. To me that doesn't do much. Don't get me wrong, I see the dots, I just don't see how they actually connect other than people wishful thinking. It seems to be a rumor that is mostly fan based, with a few beat reporters saying its not impossible. With how they word it though, there's no costly signaling, because if they're wrong they can just say "well I guess he didn't really want to sell afterall".