BYU's Football success has always hinged on having playmakers, and no glaring weaknesses (as has been pointed out many times on here).  It has not necessarily depended on having NFL talent or significant depth.

BYU's best 5 year stretch of draftess was '81-'85 with 16.  This was the pinnacle fo BYU's success/talent relative to other programs and it would be great if this were a repeatable model.

BYU also had 16 draftees for the 5 years of '98-'01.  There was some serious talent in that group, but because of weak spots and 'meh' QB's, the records were underwhelming.  Even the 2001 team turned out to be mediocre after one player (Staley) got injured.

There were also 13 players drafted from '01-'05, again, lot's of talent and a pretty crappy run.

Arguably BYU's best team ever, 1996 did have some great players (i think 6 total eventually drafted) but that team's biggest strength was a great college QB (not drafted) and no real weak spots.

The Detmer years were good because of Detmer (drafted 9th round - would not be drafted today).  One guy can make a huge difference.

The worst 5 year draft period for BYU since 1970 is, in fact '11-15, but this is seems like more of an indictment of the talent of or NFL perception of 'RM' type players. See this post.

Ultimately, I don't care if any BYU players get drafted, I like winning.   I do realize that having NFL talent isn't going to hurt, but lots of NFL talent can still make a 6-6 season.  

I hope BYU can ratchet up the depth and still get the playmakers to be consistently better, but they aren't really any different performance-wise than ever (link), except they're doing it with a bunch of balding ex-zone leaders.  Impressive actually.

Note: above analysis only counts players drafted in first 7 rounds.  Also, 2015 record below is typo not prediction.