I bought a Lumix but did not intend to completely stop using the DSLR for main photo shoots. However, I found the quality of images from the Lumix were so inferior, I had more or less stopped using it. However, my back problem is not improving with age so it is inevitable that I will have to buy a lighter system soon. Many of the mirrorless systems are not much lighter than DSLR's so whatever I eventually chose will be a compromise. However the IQ has improved since I bought my Lumix so I am hopeful that I can find a suitable compromise. I am sure I will still use my DSLR whenever I can though. I recall a very successful photographer who had a serious hip problem saying that "the only things worth photographing were within 300m of the boot of his car".
Dave