A robotaxi isn't enough to fix Tesla's problems, analyst says. Here's what Elon Musk needs to do.

• Wedbush analysts said Tesla pushing off a cheaper EV in favor of robotaxis would be "a debacle."
• Reuters reported Tesla halted the development of its affordable EV to focus on a robotaxi. 
• Wedbush believes full autonomy won't be reached until 2030, making an affordable Tesla "crucial."

The robotaxi that Tesla CEO Elon Musk teased would be revealed by the end of the year is not what the company needs to focus on in the short-term, according to one prominent analyst firm.

Instead, it is "crucial" that Tesla delivers a sub-$30,000 car in the next 18 months, Wedbush analysts wrote in a note published Thursday.