I believe that we've for the most part made the transition to metric on contemporary bicycles -- at least for the tools we use to repair them, am I right?
For example, while many screw threads are still imperial (or whitworth or some bizarre French/Italian/British concoction), the actual fastener heads or shanks are metric. For example, pedals are 9/16" x 20 tpi but we've standardized on 15 mm for the pedal wrench (or a metric allen). Solid axles might be 9mm x 26 tpi but again we've standardize on 15mm for the nut.
Are there any parts of non-BSO bikes coming off the line where we might still expect to still need a non-metric tool to take a component off of?