I don't expect those games to be delayed either, just because they were already delayed. Corruption should have been a release title, the other two were supposed to come out in early 07 if I remember correctly.
It is also no surprise that those games will be released so early in the consoles lifecycle, it was exactly the same with the GC. For europe the schedule was:
GC launch may 02
SSB launch june 02
Mario launch (around) september 02
Metroid launch march 03
zelda launch may 03
I never had the feeling that there were less games after that period, Nintendo has a lot of other franchises up in their sleeves. But I think something has changed in the last couple of years: Games are announced much closer to their release date, i.e. you hear first about a game around a year before its release date.