The reason for and outcome of having software in escrow is to mitigate risk and reduce costs should the software developer cease to be able to support your business application(s) - that is software insurance.
To do this you must have access to the source code.
If the software developer has not provided you with the source code, or has put restrictions on the use of the source code as part of the license agreement, then you must have the source code in escrow to mitigate that risk.
Should a release event occur, we follow the procedures in the escrow agreement and release the source code libraries to you.
Once you have the source code you can, either
Use your own staff to maintain the application, or
Retain another developer to perform the maintenance for you