I doubt it.All the younger people that I see with them want the shorter barrel with the folding stock because it looks cool and that is what they see on TV.I don't think new recruits train on the same type of M16 to begin with some train with an A1 or A2 orA3 and I'll bet no one gets an M4 in basic.(I could be wrong). When a new replacement rifle comes out they will fall in love with it.Younger people like high-tech and plastic.
I have a Colt SP1 Vietnam era and a match AR-15 and no one has any interest in them at the range but pull out an M1 or Springfield and everyone is checking it out.
The M16 cannot really be collected as it's predecessors .We can buy a real GI M1 or 1903 or carbine or GI 45 that was used by our military.The AR-15 has no cartouches or dates to collect,no wood to refinish no history,as they will all be semi-auto repros and not the real deal.
A good example is the M14. Bring an M1-A to the range and many shooter don't even know what it is.