The claims that Gridcoin rely to much on BOINC and that it can go down is over exaggerated. BOINC is Open Source and can be set up by anyone. There are several projects currently in existing that are using BOINC that aren't on the whitelist of projects.
There is no risk that BOINC will seize to exist suddenly without any notice since it's both running projects that would tell in due time that they will spin down and the fact that the code for making a new server is easily obtainable by anyone trough GitHub.
So no, it will not disappear tomorrow, or next month either. These latest post has been very vivid hypothetical "What-if" senarios without any real substance.