You meant to ask if a government that does UBI can ever stop doing it and offering some other kind of assistance?

Not quite. I'm concerned that they would offer UBI, and then add conditions later. It's pedantic to think that officials would care that this is "not technically UBI anymore." It would be called UBI, but you would be required to comply with different standards to receive it.

A government can always take assistance down, add rules, expand, shrink, do whatever with it. It can also use whatever name it wants.

Then it seems like a very bad idea to put the security of your home, food, and livelihood entirely on the whims of the government to such a degree.

Hum... If you are saying that people shouldn't willingly depend on social assistance, I don't think you will find anybody to disagree with.

If you are saying that people should be free from government's whims, congratulations, you've just discovered Democracy. Anyway, if your government has whims, the security of your home, food and livelihood is entirely dependent on them. It doesn't matter if you depend on social assistance.