No you shouldn't. They may eventually become very active, if you give them good enough reason to. Keep in contact with them and try to connect. Sometimes they are just looking for a bit of reassurance that SFI isn't a scam, or that you just want them to earn vp so you can earn more. Therefore, you must show that you care about them and their success. E-mail them with your weekly newsletter. Try to get them re-engaged.