If Alex plays a full season (a big if, considering the weakness of his OL), I'll be surprised if he doesn't throw for 4000 yards. He'd already be over that pace if not for all the drops and mental errors by his receivers, but I expect them and their chemistry with Alex to improve a lot as the season goes on. Same for the OL.
Time to break out the post-"We Want Carr" stats again:
2010: 98/168 (58.33 completion%), 1264 yards (7.52 ypa), 10 TD/2 INT, 97 QB rating, 3-1 record
2011 + playoffs: 309/513 (60.23%), 3639 yards (7.09 ypa), 22 TD/5 INT, 92 QB rating, 14-4 record
2012: 153/218 (70.18%), 1737 yards (7.97 ypa), 13 TD/5 INT, 104.1 QB rating, 6-2 record
2013: 88/146 (60.27%), 957 yards (6.56 ypa), 7 TD/2 INT, 89.9 QB rating, 4-0 record
total: 648/1045 (62.01%), 7597 yards (7.27 ypa), 52 TD/14 INT, 95.1 QB rating, 27-7 record