ESPN has compiling lists of who they project will be the top 10 players at every position 3 seasons from now in the year 2016. The Eagles are unfortunately not represented well in these future power rankings. They were shutout, even for honorable mentions, in QB, WR, TE, pass rusher, S, CB & LB.
A creative Chip Kelly offense requires linemen who are athletic and great in space. They must also be in shape to run the high volume of plays required. He is an ex-quarterback and tight end, which is an example of his athletic ability. As well as he plays, there is still a lot of room for improvement. He is not a power player, but he wins with balance and position. He seems to have a good feel for blocking angles. He gets to the second level, adjusts on the move and fits perfectly in this up-tempo offense.
It's certainly an exciting forecast for Johnson's career and if he the 4th best OL in the NFL in 3 years it will probably be a good indication that Chip Kelly's program will be moving along quite well.