That 「と」 is indeed quotative as you guessed. If so, where is the verb that follows the quotative 「と」? It is just left unmentioned.
In meaning, that question is the equivalent of:
Note that the unmentioned subject of the unmentioned verb 言う/考える, etc. is "you" the listener this speaker is talking to.
To intentionally form a highly unnatural sentence without any words left unsaid so that Japanese-learners might understand the original sentence, how about this?
= "What are you saying/thinking that we should do after talking it over?"