Just feeding the regionals. United have thousands of resumes from adequately qualified people to pick from.
If someone started flight training tomorrow it would be approximately 4 years before they had 1000 hours TPIC and be eligible for a spot at United (if the person already has a bachelors degree). If they dont you can ad another 3 years at least.
So if you then factor in the odd checkride fail, bad mark on your personnel file, too many sick calls or just losing interest in general etc, you can cut the number of graduates who make it from start to United by 70% at least.
Not really a quick fix all.