Bit of a moot point for me at present as all I have is an old Lumix LX1 with manual settings that still takes good photos at 14 years old (just super limited due to sensor size and a 400 max ISO) and had to sell the DSLR for financial reasons. Still have a dream to get back into photography if things ever look up enough I can justify spending on a hobby. I really enjoyed it. I would love to do some astrophotography especially. Even an original 6D (superb low light clarity) and the right lens would probably suit me for life with no compromises to my interests as long as I could keep it serviced and alive. Tried shooting the Milky Way recently with the LX1 but the low light ability won't allow it.
Bright side is maybe even if mirrorless is the future, it would make DLSRs more affordable used as people sell off the "deprecated" tech.