It's not a problem if their driver recruitment material reflects that. If the message was "Drive a black car for occasional UberBlack fare, beware that you must accept a certain percentage of lower UberX fares, and that at some point you will be replaced by a driverless vehicle", it's truth in advertising and drivers get what they sign up for.

Driver ads, however, display successful-looking models quoting some unrealistic (as frequently pointed out by quite a few news sources) dollar amounts, and let's face it, the clientele it's targeting is very removed from robotics/AI development, unlikely to have an economics degree (or speak fluent English, for that matter) or disposable income to trade up / trade down their vehicle of choice to reflect the strategy of the day.

Your argument can be rewritten to apply to Countrywide Mortgage and fake Viagra peddlers, does that make those businesses right?