Good question. I didn’t see myself going Line 6 either; I had an XT back in the day then went Vox tonelab then real amps then 12+ years with my Mk1 Kemper. I genuinely believed I’d stay here.
Before automatically pulling the trigger on Mk2, I was really trying to figure out what’s actually new in the Mk2, hardware wise…. The reason I care about this? The mk1 had enough legs in the original design to support years of worthwhile improvements. Although miracles can happen, it is less likely that we’ll see constant improvements over 10-12 years in a box that is the same hardware. Yes, I know I can’t say this / don’t know this….. logically, what I’m saying here makes sense and I’d feel much better if the company said ‘this, this and this are new inside there’. I want to confidently buy something that isn’t the same box I bought 12 years ago because that just doesn’t feel right to me. It’s attractive to some folks. To me it isn’t.
Thanks,
I understand what you're saying. When we buy something new, some like and want big changes to see a real difference.
As a consummer who has been lobotomized with advertissements since my childhood, i've lost many years thinking new stuffs are better and will make me things i can't with the actual i own. It's a fact but at the end, i don't use them 
When i bought my Stage, i had the Helix which can be perceived as a newer unit (color screen, joystick, capacitive switches, rings led colors...). I bought the Stage that seems to be old-fashionned till day one. But how i love it !!!
It's thought exactly how i imagine a stage unit ; clear, versatile, simple....
Technology advances rapidly and I doubt any new gear, including MK2, will last a decade like the original did—3-5 years seems more realistic.
Nowdays, modelers/profilers seems to be made to last for years. Customers are ready to pay 3/4 times the price for a device but it has to last.... L6 had HD400/500 before and changed their mind....
Reason why i'm a little disappointed, my Stage mark I is only 5 years old.... It's far from the 12/13 years i see everywhere. I consider Kemper as a long duration perspective (as a Fender Twin or stuff like that)....
I really hope that Mark II is just a face lift and that mark I will be able to do a lot of mark II things in future.... For example, I don't understand why i can't have fixed FXs on my Stage ? 
I'm not necessarily interested in profiling mark II (if i can't)....
I think mark II is just a small improvement of an existing product. Who are concerned ? I don't think that a lot of new customers will come overnight...
I don't think all mark I owners will sell them to buy this new one. I see more poeple who wanted to try Kemper and just buy this new one or Kemper owners who wants to expand their park....
I think that modeler/profiler market starts to be saturated too...And i assume a lot of customers can't buy a 1000€/2000€ unit every two years...
I assume the majority of Stadium customers will come from Helix Familly. This product seems really promising but it adds things i don't need at all... And changing familly product, even if it's not difficult, means you gonna lose time to get used to it.
A lot of competitors have launched wonderfull devices but i feel like it didn't take.... I think about Headrush prime for example ; i don't believe that they've canibalized all the market 
and their device is really close to Helix Stadium imo....
I imagine Kemper could launch a total new product with a lot of glitz, parallel paths, etc... And make evolve as they have known how to do it with success the previous devices...