Change.org is a weird thing, people write these impassioned pleas for things, and honestly I doubt very much they influence much of anything. I know the B&O Museum has had some rough sledding, when the roof collapsed several years ago, and they are also facing the perception that Baltimore is this scary place where you go there you will get shot; it is true Baltimore has problems with violent crimes, including homicide, but that doesn't mean someone visiting the museum or the city would be in much risk. NYC had a murder rate of 2500 in the late 80's, yet most of that was concentrated in areas few people would be likely to go to. I think any museum can use help from various government entities, better street lighting, repaving the roads around it, maybe grants for historic preservation (and for all I know these things already have happened with this museum), but takeover? Given the state of the national park service, that despite being very popular (they are getting record crowds) their budgets have been slashed and fees that were supposed to be used towards making the parks better have been diverted (the RV community is really angry about that one),so they likely wouldn't help.
I hear complains about Steamtown, but my answer to that is if the National Park Service hadn't created that, what would be in its place? I don't think the government is the answer to everything or they necessarily are the best people to run things, but at least with Steamtown there is something there to go visit that wouldn't be if they hadn't of done that. Personally, I would rather spend federal money on Steamtown and the National Parks service than on a lot of what it is in fact being spent on these days, but that is getting outside the realm of this discussion.