For the foreseeable future, machine learning experts will be in sufficient supply for them (i) to have wages which are considerably above zero and (ii) have the ability to raise capital from people that don't think they're commodity labour

(it cuts the other way too: if an oversupply of labour in a field as difficult-to-learn as ML does arise, the demand shortage causing wages to fall is almost certainly because ML techniques aren't giving companies and traders as much of a financial edge as they hoped for...)

Added bonus for the ML experts: in a lot of the possible areas they can choose to work in, their individual marginal contribution to the company's profitability is at least as quantifiable as that of a salesperson. In many areas of finance you can quantify the impact of an individual line of code!