Nope, they didn't wait, they were just ignored by the media for some reason. NYN had already been a hit in the USA and it spread over here, but their follow-up releases completely missed here. I think possibly one or two of them reached the lower reaches of the billboard charts.
I have all of Odyssey's first five LPs on mp3. Native New Yorker is on their first LP. Their next hit, in summer 1980 was from their third LP.
Interesting. It has always appeared an oddity to me, coming out with such a fabulous Top 5 single and then hearing nothing much more for such a long time, and then smashing to No1. A strange choice not to nurture such clear talent, who had numerous top 5 80's classics in the end, none dated to this day.