The governor doesn't have to wait. He can take the bull by the horns, charter a few bussed, head down to San Antonio and make his pitch. Well he can do that if he actually means that bit about boosting his state's productive population and isn't just virtue signaling. It's totally win-win.
I don't think our governor is obligated to do something out of the way and unusual in order to counter a stupid, and possibly illegal, action by another.
In any case, unless he intended to pay for it himself, he does not likely have the authority to charter buses, and may not have the legal authority to move people around either, nor to make promises that cannot be kept. He can say what he'd like to see happen, but that does not mean he has the legal authority or the legislative approval to make it happen.
e.t.a. Scott has come out in favor of VT law superseding ICE practices, and supporting the rights of immigrants, including undocumented immigrants, to immunity from harassment, supporting the extension of DACA rights, refusing to remove children from families at the border, and in favor of increasing VT's labor force, but I imagine he is not able to advocate for illegal immigration, nor to violate ICE practices in other states. He is, also, despite what many would consider some good and humane ideas on this subject, a Republican with conservative economic principles, and there is likely a difficulty reconciling some ideas with his opposition to raising minimum wages, family medical leave, and other such issues. My point in the above is not to suggest that Scott is just fine and his ideas all good, but simply that he is not a grandstanding racist idiot.