No, it means they need ported to Wii U, not that they will never happen. Converting an ELF to RPX would essentially be the same as trying to open a JPG as an AVI file, it's not the same as
porting a piece of software. That's done in C/C++ etc from a source like Cafiine or the OsDriver hack. That's not to say it's not possible to switch between formats that something supports though, such as ELF and DOL. ELF is essentially a container, not platform specific (although the ELF itself may be). If just converting any old ELF's to RPX would work, I'd be converting a whole library of PS2 games!
As far as the Wii and GC homebrew go, it's not surprising they will need ported. They will come eventually, just stop being so negative.