There are ways it could be made more suitable, while retaining some of its inherent benefits, but that is another issue. I argue that these people obviously have little experience dealing with countries other than their own. Measurement standards are great things to pay lip service to, but putting them into practice never seems to work out as perfectly as their proponents would like. Japanese metric, Australian Metric, and French Metric all have their quirks and eccentricities. Standards of measurement are tools, nothing more.
Different people use different tools for different jobs.
The Metric Gestapo needs to start taking this into account, as do those who resolutely refuse to consider anything other than Imperial or Standard. There is plenty of intellectual laziness being displayed in both camps, on what is really a very simple issue.