A GPL license helps but if support for a dependency is pulled you'll likely end up needing to divert more resources to maintain it anyways. There really isn't any guarantee against this cost - you either pay someone else to maintain it and hope they do a good job, build it in house and become an "also that thing" company, or follow a popular project without financially supporting it and just hope other people pick up your slack.

Preferring GPL licensed software means that you're immune to a sudden cut off of access so it's always advisable - but it's really important to stay on top of dependencies and be willing to pay the cost if support is withdrawn. So GPL helps but it isn't a full salve.