In the past, no one wants our young players - they leave on free or for peanuts and many eventually don't make the grade at top flight level. I see this as a positive sign. I mean it's not like we are selling TAA after his first season with us.
No doubt it's important to develop players for the first team but it's inevitable that not all will make it here. When the price/deal/circumstance is right, I think it's logical - esp. for bigger clubs where it's even harder to make the breakthrough. (Of course, there will be bad deals occasionally - the one where we should've hold on to the player longer for the player to develop into one who can successfully break into the starting XI or at least command a higher fee)
Young players would still be interested in joining us because they know even if they don't make it here, they would improve and be able to continue their career at a decent level when they move on. (Juve and Chelsea may be extreme cases, but you get what I mean 🙂 )