Hi
SCBCD seems to be the most difficult certification in the Sun's offerings, and as such
EJB technology is very widely used in the industry and will be around for a long time to come (I hope so). As Sun's flagship technology offering, they have made sure that even new web services don't replace the EJB but interoperate with EJBs.
Just like a vendor who offers complete range of products to suit a particular segment of requirements, we as developers with multiple skill sets will definitely benefit in terms of better jobs (and pay may be). So if you like to work with J2EE technologies, at least go for SCJP, SCBCD and SCWCD. This will definitely reflect your commitment to these technologies, and may take you to new heights in your career.
Just my thoughts, others may have differing views..
Thanks
Tejas