I'd love to tinker with a new camera system, but it took me years and many a $ to figure out what Fuji lenses I like. Going through that process again on another system seems tedious, for the somewhat minor gains it will yield. I think I'd mostly re-buy what I have (Fuji+GR).
Although I would perhaps consider replacing my X-Pro2/23f1.4 with a Pixii, just to satiate my curiosity...