Whilst it sounds great in practice RB the key word you use is develop. Unfortunately development of young players involves managing their careers and does not involve throwing them in before they're ready.
Fans need to be careful when using Sterling as an example of "if he can do it they all can". If it was that simple no club with a half decent youth policy would ever need to buy players in. For those who use Sterling as an example consider a player like Flanny as well. Came in and had a few good games then after a couple of bad ones read what is written on here for example...he's ****, he can't do this and he can't do that...etc etc. Now he looks like a lad who's confidence (often a youth players biggest attribute) has taken a severe beating.
Also take into account the physical strain top level football has on young players especially. Look at our last crop of quality young players (Jones, Fowler, Owen, Gerrard,Kelly even more recently) and see how many have had terrible injury records once they got older.
Granted a competition like the COCup is where we should be seeing the young players given a chance but I'd hate to see the futures of this decent crop of players ruined by bad management, fans expectations and physical exhaustion.
And for those who think that this was the plan all along...pull the other one.