To be fair, they gave him his own series twice and had him as one of the stars of the Threshold series, making him a lead character in three different ongoings, all of which failed to gain much traction. All three of those can be seen as earnest attempts to push him into a greater spotlight. The character hasn't been able to generate the sales interest they hoped he could.
I think they are more or less letting his character simmer for a while. I don't really think he has been abandoned. I'm with you, though, in hoping that they find a way to give him more attention.