At this point, Raji needs to stay. Pickett is solid against the run, but it doesn't look like any of the other DT's are capable of getting much pressure on the inside. Raji is at least average at that with the potential to be good, and a team can win with an average push up the middle. If anything, his recent average performance should make him more affordable. Losing Raji and Pickett continuing to age and perhaps decline soon is a really bad idea. I understand the numbers simply may not work out, but Ted should be able to figure it out, somehow. I trust Ted's ability to find receiving talent much more than I do defensive line talent, if it were to come down to that.
I still think Raji can be a very effective DT/NT, but he really needs a dynamic player beside of him. Hopefully someone currently on the roster will eventually fill that role, be it Neal, Worthy, Daniels, Wilson, et. al. Most of those players have shown glimpses of having that ability, but seem to disappear more often than not. Hopefully they will progress.
Finding a large athletic man such as Raji is extremely difficult. I don't think it's time to move on from him yet, I just think it's time to find a good to really good talent to play beside him at DE in base and in the middle in sub-package's. The synergy of Raji + another really good big man would result in exponential results on the field, imo. In terms of pass rushing defensive linemen currently, it's mostly just Raji and 'a bunch of guys', as far as I'm concerned. I still really like Neal, and think he could be that guy, but I'm starting to doubt that. Obviously Worthy is just getting started, but beyond a few plays, I haven't been impressed, so far. I like Daniels a lot, as well, but he has yet to really shown anything. They are both players that aren't prototypical 3-4 DT's, but specialize in penetrating while rushing the passer. That's exactly what that Packer's need most currently.