(crossed posts with Greg)
One thing to keep in mind here, if you have those plug-ins now, you would still have them going forward. So backwards compatibility is likely not going to be an issue. And they would likely remain readily available if one needed.....
But, even so- they are quite old. Things have advanced a bit since they were more current. One might opine that their biggest redeeming feature is that they were and are freebies.
So there may be other good reasons to look at options, perhaps far better reasons than concerns about their future inclusion or lack there of.....
Such as 64bit, more current internal processing standards, etc.
Just an opinion.
(Full disclosure, and FWIW I haven't used them since perhaps MX5 in any of my own projects. And I think they were dated even then!)
But I do see them used in collabs and other people's projects from time to time, so I do need them to load in those situations.