I share your concern, but I look at it like my DSLRs - they're worth so little used that it's just not worth selling them. I'd be lucky to get $200 for my Canon 20D or 5D, and with that $200, I could maybe buy a low end point and shoot. What can you get for a used Solo at this point? $300? You can't hardly buy a bind-and-fly 250 racer for that. So if my Solo gets grounded 1 or 2 years from now, I have that long to get $300 worth of use out of it, which isn't hard to do.
Does it suck? Sure, that's the risk betting on the new company. A year ago, and I think still, they had the better platform. Hindsight is always 20/20, so it's pointless second guessing our choice now.
As far as motor pods, as long as 3DR is using the Solo to serve the enterprise market, they'll keep making them. Still time to pick up a few spares.
Also, don't think you'd be in a much different position if you chose a Phantom 3 last year - the Phantom 4 is now out, the 5 is just around the corner, resale on the 3's and 4's are probably in the same ballpark as the Solo. And DJI isn't going to make replacement parts forever - they want you to buy a whole new bird this year, and next, and the year after that.