All you say is true but the step from say a Spiderbox to a Linux based receiver is not that big a challenge in truth.
Now lets make it clear, for ease and simplicity of installation receivers like say the Spiderbox and Technomate TM5302/5402 are a piece of cake for most as you just need a usb stick and a few minutes and away you go.
I and I'm sure all our members will know someone who simply cant handle a piece of electronic equipment be it a DVD recorder/Freeveiw/Freesat receiver or even the time controls on a central heating clock this is not their fault it's just that their skills lie in other area's.
I would not dream of stripping my car engine and putting it back together but my son can do this easily, but he's lost if I tell him to install a transponder in his satellite receiver, whats simple to him is difficult for me and whats simple for me is difficult for him, that's life some people are better at somethings than others.
Sorry rambling a bit but I'm sure you get my meaning, now as I said before Linux receivers are not that difficult where we see difficulty is (in my mind) the way members who are familiar with the subject assume the reader is also familiar with the terms he uses and you see sentences like "ftp into/this/that/the other/folder" without any explanation what an ftp is or where you would find the folder. BUT when you do grasp what is going on the scales fall from your eyes and suddenly it's not difficult at all in fact it's just a small step in learning. You will kick yourself that you ever found it difficult as it's not, it's really seeing what the poster is saying then carrying out the process.
I would say don't wait for the ideal receiver to arrive it never will, if you want what you've outlined above then get a Linux receiver that meets your requirements and have a go, you might get a few hours of frustration (I did) but then the blinding flash of understanding and you've mastered the subject!!
Remember the Spiderbox receivers are great, simple to install/setup/use and my 9000 combo has given my three years of enjoyable viewing, if you want to delve deeper then go ahead there's plenty of choice.
P.S. I also have a VU+Solo and their not as bad to setup as I feared, we always fear the unkown!!