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It would have to be significant in some way. I would hate to put too difficult boundaries around it as witnesses are not too eager to do anything as it is. Some of these exchanges are fast growing, some are multilingual. Will they adopt both SBD and STEEM? Are they a fiat portal? These are important things to consider.

Witnesses do take steps every now and then to get Steem listed.. Typically it requires a coordinated effort across multiple social networks to motivate enough people to vote for it in an exchange's forum or something along those lines.. In such cases it tends to be multiple witnesses who get involved.

In any case, I will see if I can slice out what little time I have left after attempting to on-board some of the millions of users who witnessed the recent mass censorship on FB, trying to get Steemit inc. to fix completely basic bugs in Steem, putting together data and a proposal to support witness vote decay to keep the witness tables relevant, working with oracle-D to grow their presence and ability to draw money into Steem and pulling out useful stats via SteemOcean.com - (such as that one of the biggest self voters on the network, constantly posting almost empty posts is directly connected to berniesanders..).. reminding myself how to work with C++ so that I can prepare to test future hardforks myself to prevent the problems we had with the last one - Plus keeping my 'day job' and numerous other things.. lol

Who knows.. maybe there's a simple way to get a listing arranged :)

Oh and working with the developers of Steempeak.com to improve their features.