Where have all the tuis gone?

We had a large tree just on the other side of our back fence. Although we never saw their nests, a large number of tuis made their homes there. The tree was alive with bird noise in the morning. We saw many tuis in our garden. They particularly liked our plum tree, but they were everywhere. A few weeks ago the tree was cut down. Infill housing makes good town planning sense. The two houses backing on to our section have been removed, one, is actually on trailers right now ready to be moved, The sections have been cleared, Five townhouses will be built on the site. But the trees are gone, and so are the tuis. We have blackbirds, sparrow, but no tuis any more. I wonder whether the tuis just migrated  elsewhere, rebuilt their nests there, quite elaborate complicated nests, or perished. Relocating, finding a new place where their can be at home, appraising possible new threats, accommodating to other birds, can't be easy for tuis any more than it is for people who are dislocated.