There are no such plans because we are here to support the community and advance the use of Bitcoin. In the unlikely event that we had to close down, users would have nothing to worry about.
Since our code is open-source and publicly available, developers from around the world can maintain it and add new functionalities even if the SatoshiLabs team are no longer available. In extreme cases (although this is not recommended), it is possible to use the recovery seed to recover your funds in one of many different wallets as well - even a hot wallet on a phone or computer.
More about security threats: Security threats
List of some compatible apps: Compatible apps