With FreeBSD being so mature and old as it is, I think it's a given that the chance that it will continue for many years to come is very high. Sure enough, the risk is higher than going with "mainstream" Linux, but if you have the expertise, especially within the business, then it's a no-brainer if you will clearly benefit from all the great things FreeBSD has to offer. We're running FreeBSD with jails and ZFS etc. on a lot of servers and we're very happy with it. It's not hard for a Linux expert to pick up on. Anyway, that's my opinion.