No. You can never predict when you will need support. A current service agremeent ensures that support services are available if and when you do actually need them.
Remember that a current service agreement not only provides you with technical support, but you also continue to receive all the patches/fixes, updates and new versions of your software product.
Not sure of your service agreement status? Request a quote here.
(The quote will tell you your current expiration date and give you pricing information on continuing your valued service agreement.)