He's arguably already had legitimate and impactful successes. Building a business even remotely capable of commercial spaceflight is a huge deal. What Tesla has

He's arguably already had legitimate and impactful successes. Building a business even remotely capable of commercial spaceflight is a huge deal. What Tesla has done, both in batteries and in getting the major auto makers to put focus on EVs is a huge deal. Musk arguably does significantly more talking than doing, but his goals are lofty enough that even failing to make it halfway still means significant advancement.