Why dont CCP make 2 modules:
One which keeps the current WH stable, where it wont get penalised from ships passing through it as long as the module is at work with it. It should consume fuel to keep the work.
And the other one to close the WH by consuming a certain fuel. So players wony have to sacrifice ships to close it.
Are you talking modules for ships or things you anchor? You weren’t very clear.
Also…no. Wormholes are meant to be unstable. It’s part of the whole balance of J-Space. What you’re proposing (assuming it’s anchorable structures) would turn J-Space into something like nullsec lite with semi-permanent entry-points and/or allow capital ships to flow much more rapidly into J-Space.