With our our ground game (and OLine), I don't see us reaching 3700 passing yards.
The O Line is the one obvious question mark. I hope that with this much time our coaches are at least half way to fixing the problem. (They just have to be decent this year)
As for the ground game taking away too much production to allow for 3700 yards passing I don't think so, and here's why.
PASSING
2012 - 477 attempts 285 completions 59.7% 13.3 avg
2014 - 453 attempts 281 completions 62.0% 10.4 avg
RUSHING
2012 - 413 carries 1924 yards 4.7 avg
2014 - 524 carries 1903 yards 3.6 avg
Take out Dobb's carries last year and it looks like this
2014 - 420 carries 1434 yards 3.4 avg
So Point One:
In 2012 we had 964.17 total offensive plays if you adjust for not playing in a bowl game. In 2014 we had 977 total offensive plays. Butch Jones ran more plays last year than Dooley in 2012 even though I would argue the fast and high scoring of both us and our opponents in 2012 would make a higher number of plays more probable. In short, we are playing fast-paced football on offense.
Point Two:
If Dobb's stays healthy and starts the entire season I believe it is reasonable to expect/hope for him to improve his accuracy to 67%. So using 453 attempts from last year that is an expected 303.5 total receptions in 2015. If our passing game were to achieve the average yards per completion our 2012 team did then that would put our total passing yards at 4,036.
Point Three:
Though the 2012 Vols are considered a pass heavy offense, they accumulated more rushing yards than last years team on much fewer carries without the help of a rushing quarterback. Without Dobbs last year we posted a 3.4 yard average per rush compared to 2012's 4.7 average. If you are passing well then you are running well and vice versa.
Got a little side-tracked but all that was to say if we can work around our O Line problems and get the ball out to our wide receivers quickly then the sky is truly the limit for this offense. Everything runs through Dobbs however and I don't see Hurd and Kamara pulling from his passing stats much if any. It would be more likely for success in each area to improve the success of the other.