I'm sure we're gonna see most installers/modders selling those. If it's offline only, i'm in.
Edit: Current poll at 4PDA regarding the MIGSwitch, if not too expensive, people might buy one:
What is the maximum maximum price for a new flash cartridge for you?
Any price is acceptable ($200+ or...
It's all up to if you are doing it yourself or through someone else (installer). An installer/pro may still have some SXCore left so go with it.
Otherwise you can try the 'new' method through the rpi/picofly. Hopefully it will work for a long time but as it's quite new, we don't really know...