McCown and Bridgewater are almost certainly here for only one year(2018) - the beauty of this situation is whichever QB is picked - will not see the field till 2019. Hence, it seems for purposes of this bridge year -The present OL(if healthy) while not elite - certainly seems at least adequate or middle of pack by NFL standards
Pete Carroll was dead right about Sanchez - saying initially/reflexively that he needed another year in college(as Sanchez was about to declare and immediately there afterwards).
As for Geno, among several pre-draft whispers - were sentiments that Geno did not perform consistently well in cold weather games - while this was not an absolute and exceptions certainly exist - if you look back on his starting tenure with the Jets his best & most complete games for the most part were in a dome(Atlanta) or warm weather sites(Miami). SD might be a good spot for him provided he ever sees the field, but it seems he was a natural fit for Atlanta or NO(domes & lots of warm weather games).
Hackenburg was a roll of the dice - the hope, of course, was his mechanics could be altered to align with his physical stature so as to replicate his freshman year at Penn State. It seems logical that in light of the fragility of McCown & Bridgewater - either Petty of Hackenburg could be brought to camp regardless of taking a QB with the 3rd pick. So Hackenburg's JET book may not be completely closed. It would not be shocking if the team carried 4 QBs this season although much depends on Bridgewater.
Relative to the OL and any other holes on the team this coming year - the Jets are going to once again have an enormous amount of cap space next year - so when the 1st round QB pick doesw eventually take the field next year - there will be time to repair/improve the OL or for that matter elsewhere.
Thus - at this moment in time - it seems the 3rd pick in the draft will be used on a defensive end. It would not be surprising though if they did take an Off Tackle with the 4th ROUND