One can make much more money teaching tennis than playing on the pro circuit if ranked over 300 ATP. The life won't be easy even for players ranked 200 ATP. The following lists 10 players ranked #201-210 ATP. They have to pay for a coach and spend $20,000 a year traveling.
Rank Age Name Career Earning Year Turning Pro
201 28 Kirche $117,002 2003
202 23 Young $1,376,011 2004
203 23 Trungelliti $95,785 2008
204 26 Farah $345,816 2010
205 26 Ward $411,824 2006
206 26 Baker $376,728 2003
207 27 Millot $288,922 2007
208 25 Ilhan $617,578 2006
209 32 Robert $760,477 2001
210 32 Yani $397,821 2003
Yes, Life won't be easy, moneywise, but what if not using that as a meter?
There is plenty of sports where there is no (real) possibility whatsoever to make serious money and despite of that many young athletes are investing all their time and energy trying to succeed. not going to college, or postponing that several years...
For example how many world class wrestlers, boxers or track and field athletes make serious money, really? Some do of course but most of the Olympic level athletes are making very little, even olympic gold metal leads no real income in most of the countries (US not included perhaps) most of the time. Succeeding olympic athletes finance their hobby (?) with the help of relatives etc.
If Deit and his dad went all in and ended up top 287 atp with minus balance tennis account, who considers that as a failure? I'd still think that as a heck of an accomplishment considering how difficult it is.
Being former atp 278, knowing you went all in can be a satisfying starting point for the rest of your life. People can waste their youth years for much stupid things I think. No college graduate but so what, there is plenty of other options still available...
If choosing college leads thinking afterwards you've made heck of a compromise, then I'd choose all in, no college, even 5 years futures and challengers, if thats financially possible.
Trying to reach a goal, even with no guarantees succeeding, even when odds are against it, can be a satisfying life. If you see the beauty of it. And yes, I've heard what the reality is there chasing points, I know many personally who ended up 150-300, made no money whatsoever are family werent rich. for some spoiled brats probably that kind of life is too much ofcourse but I don't think thats the case here.
If thinking tennis as a financial investment, like some of here seems to think, then of course prolonged futures and challenger route in tennis (or selecting 'wrong' sport) is not wise.