Well I suppose it depends on your staff and upgrades you have. What is your coaching staff at? Do you have a training hall? Is it upgraded? If you had none of the above and even at 20 teamwork it would take a literal month to increase a single stat by 1. To be more specific that is around 30 points a week for 18 weeks for a season and you get 540 points a season. So, 5.4 skill points a season. So in 5 seasons when your player hits the decline they would only have gained 25-30 skill points that you cannot completely control. His age is the biggest concern. It is difficult without the above information to accurately judge him though.

I'm not doing this to say my qb is better than yours, I'm using mine as a reference point. My qb is 19 years old with 5 vision, 11 intelligence, 4 footwork, 6 carrying, 5 passing, 15 speed, 14 strength, 4.5 talent, 2.5 stars, 10 teamwork, and 20 consistency.

So, take my qb above with no upgrades in staff or buildings, combine his 10 teamwork with another 10 or so points a week he gets for training. That is 20-22 points a week he gets. 20 times 18 weeks equals 360 points, which is 3.6 skill points a season he increases. Now, 3.6 skill points a season for the next 5 would get me to your qb's age and I would have gained around 20 skill points (add half of this season as well). So, now my qb is 24 and lets say I focused on passing and vision. Add 6 to each and I am at 11 passing and 11 vision to go with high carrying, strenth, and speed. This qb can run it and throw it with 5 more years to gain another 20 or so points. It will be more because I have and will have more upgrades. I'm focusing on fitness skills now, so he will have HIGH speed and strength and stamina. So those 5 years are important.

Does that make sense?

That may be, but we are just answering the question as to whether this QB is great long term. I think the answer is, it depends on you upgrades, and ultimately, for long term I don't think it is the answer. He is the short term answer. Short term meaning 3-5 seasons.