Depends, really. If you don't need an actual widget system, yes, it's likely sufficient. Otherwise it's not, but then ncurses still sucks at that since it still mixes both low-level (move here in term, move there in term) things and high-level features (I want a window which is at this position relative to parent).
There is something I'm slowly doing as I'm writing few term stuff: a low level lib. Someday, I may build a high-level lib which uses those codes, but they won't be mixed. Still got to finish the tools to handle signals as properly as possible before, though (terminals mean, you *must* support signals because of sigwinch, and doing so cleanly is *not* easy).