In all honesty mate having watched that age group for some time I expect it to be much high than that. I've watched academy football for a long time and the age group of 18/19 year olds is as strong as anything we have produced and ranks alongside the period of the late 90's. I am not just saying that now, go back and check the youth teams thread out and you will see me discussing a range of prospects for the last couple of years. I never spoke of a player before they were 16 for obvious reasons but you will see the comments and I think they will speak for themselves.
To answer your question I expect more than that. Next season I imagine Pennington, Galloway, Garbutt, Browning, Dowell & Davies to all be involved. I appreciate some of them have stepped up already. There is an outside chance Ledson and Kenny could also get opportunities.
Going beyond next season I think Walsh will play for the first team. I also think Evans has a very good chance but you may be looking at a 2-3 year time frame for that.
In all honesty Davies was very good for the youth teams but looked no better than Williams, Ledson and Walsh (maybe behind them) and put in one of the best midfield performances we had seen from any midfielder for any side at Goodison last season. I think young players have ability but they need to be given opportunities and not have their paths blocked by what I would consider average older pro's.