I think flawless base, patches, auto/patches will hold there value better.. Immaculate will likely come down more over the board.
These products have some of the best cards I've ever seen though... Logoman, premium sic patches, title winners, flawless base, dual autos being some of my favourites. Plenty more hits with the stacked dual rc year too!!
I don't think these two releases are any different to losing value to any other panini release, if anything they have shown far better returns in comparison.
Don't forget when first released these cases where far cheaper than they have been going for.
I really hope flawless do come down though there's plenty I want for my pc