As Mike pointed out, all this patch does is invalidate any ssl certificates that use an RSA algorithm less than 1024 bit encryption.
This patch can affect Altiris users in two ways:
1. Anyone using their own PKI system to secure communication between NS server and clients with keys less than 1024 bit encryption will need to update and distribute the certificates they are using.
2. Altiris licenses are certificate files, most of them are 512 bit encryption so some actions taken on these certificates will fail to validate if this patch is installed. The product will continue to run but license refresh will fail to calculate once this patch is applied so customers that are close to their license limits may experience loss of functionality.
To answer your you question of "does anyone know if Symantec is planning to patch their solutions so KB2661254 can be safely installed on my Altiris servers in the future?"
Yes. Symantec is working on a remediation plan now to mitigate the effects of KB2661254 on the Altiris servers.