Interesting post from Mark Cuban. On one hand I hate to disagree since he's the billionaire and I'm not, but I'm not sure this is completely correct. He never spent a lot of time where I a, a job, mortgage, working along. He had a company he owned and got rich relatively quick.
Mortgage provides some good breaks on my taxes, not the least of which is allowing me to itemize deductions. It also allows me to forcibly save on my house while I can still save elsewhere. It's hard to force savings and if I didn't have a mortgage, not sure I could put all that other money to savings.
Discipline is hard.