Seniors on this team are as follows (starting with the biggest losses, only players with stats included):

QB Mangum (I think he plays most of this year and I think many of his problems were Detmer-related)
DL/LB Takitaki. 122 tackles, 23.5 TFL, 11.5 sacks, 2 PBU, 1 FF in basically 2 years (28 games)
RB Canada. 195/1026/8 (5.3 YPC) rushing in 2 years
LB Pau'u. 165 tackles, 10 TFL, 1.5 sacks, 1 INT, 3 PBU, 1 FF in 25 games
OL Lapuaho. 18 career starts, but missed last two years with injury. Is a very good OL.
DL Kaufusi. 98 tackles, 10 TFL, 8.5 sacks, 2 FF, 2 PBU in 2 years
OL Hoyt. 17 starts
LB Pulsipher. 70 tackles, 2.5 TFL, 1 FF
DB/LB Hadley. 55 tackles, 2 TFL in 25 games
DB/LB Anderson. 75 tackles, 2 INT, 2 PBU in 3 years
WR Collie. No stats as a cougar, but 118/1300/9 as a Rainbow Warrior
RB El-Bakri. 14/168/1 receiving, 19/69/2 rushing
WR Dye. 16/152/1 receiving
DB Shelton. 41 tackles, 3 TFL, 2 INT, 5 PBU.
DL Taliauli. 38 tackles, 1 TFL
DB Jacobson. 36 tackles, 1 PBU in 2 years as a DB.
K Almond. 75% on FG (30/40) and 96.83 on PAT (61/63)
LB Sandlin. 8 career tackles
DB Powell. 3 career tackles
DB Tanner. 2 career tackles
TE Nwigwe. 1/12 receiving
LB Sampson. 1 career tackle (assisted)
DB Fowler. 1 career tackles (assisted)
K Mikkelsen. Handles kickoffs and occasional PATs.
LS Harris. No idea if he's any good, but he has played (LS never have stats)
LS Foley. The other LS. No idea if he's good, but he has played.

If Wilson starts and Burt or someone takes over for Squally at RB, then it won't be as bad, but if you're losing your starting QB, RB, 2 OL, possible top WR, plus best DL, and all three starting LB (and the top backup), that's some issues. Not impossible, but the 19 and 20 schedules are tough:

19- Utah, @Tenn, USC, Washington, @Toledo (3-year record of 30-9), @USF (3-year record of 29-9), Boise, @USU, Liberty, Idaho St., @UMASS, @SDSU (3-year record of 32-9)

20- @Utah, Mich. St., @ASU, @Minnesota (3-year record of 20-18 isn't impressive, but still on the road v. Big 10), USU, Missouri, Houston (3-year record of 29-10), @NIU (3-year record of 21-18), @Boise, SDSU, N. Alabama, @Stanford.