Please watch the clip from Mother of the Bride above
The newly married couple was going to go to the honeymoon right after the wedding, but a problem happened, so they decided to not going to the honeymoon and stay to see what happened
The girl who is the bride in the white dress said :
- We're staying.
I think that my other 2 version is also right:
- We'll stay.
- We're going to stay.
If so, in a context where I just made a decision (no arrangement or plan before speaking), can I use any of the 3 forms (present continuous, future simple and 'be going to')?