Same here. But, the fact that Costa's secondary series was the best thing about Joe was arguably a problem. The various "Cobra" series were damned good. But, the franchise as a whole has been in trouble for years, and he was not turning that over-all trend around. Hasbro and IDW are likely thinking "keep the franchise alive" more than "keep a secondary book for a dying franchise going".
Costa has been picking up some work at Marvel.
(But, yes, I too miss him on Joe.)