I totally agree. The M series is still a fantastic platform. There is nothing else like it out there to this day. Everyone is all over the Strymon pedals, but at $400 a piece and all they do is one type of thing per pedal (delay only, reverb only, mod only, etc) it's not the same and way more expensive. Line 6 needs to get their act together. I understand they kind of have the market cornered on the Helix type of thing. But there are plenty of people who still want to use real amps and need quality stompbox effects in a small and simple platform.
Can you imagine if Line 6 updated the M series with sounds similar to the Big Sky, Timeline, etc? Game over!