Yes, there was lots of hype when 5566 joined Warner. To be fair to Warner, I think they did spend lots of money and effort to promote their 3rd album.
However, wonder what happened after that especially after 56 last concert. Was it Jungiery's idea to put 56 aside in order to promote 183 club? If so, they probably thought that 56 already have a large fan-base but they forgot that fans are fickle when their idols have no products to show. Or did 56 suffer from burnout and requested more rest? Whatever the reason, the outcome is that 56 is not as popular as before so Warner probably decide not to concentrate too much on them.