In MY canon, NO ONE DIES. Ever. Not really. Why? Because this is like, what, the 23rd, 24th century? Hello? Nanotech! Yup, nanotech. Medigel can be this miraculous healing gel by containing nano assemblers that use the material at hand (goo in the gel, injured body parts, any atmospheric gases, dirt, whatever) to repair virtually any injury (technically called a "boo-boo"). This same tech means NO ONE EVER HAS TO DIE, not permanently anyway. Why? Do I have to spell out the most obvious knock-on effects of this tech for everyone? Jeez.
OK, nanoassemblers can repair any boo-boo, they can rebuild a severed arm, leg, big toe, knocked out tooth, fix any botched cheek piercing, and even rebuild an entire body. So...all people do is periodically go to the nanoshop and have themselves backed up into nonvolatile storage by getting FULLY disassembled and then reassembled. Then they go off to fight their little reaper battles, make whoopee with assorted aliens, etc. If they go and get themselves killed, the backup is in storage and nanoassemblers can reassemble you all anew. Of course, the new you is missing any and all memories and experiences that occurred after the backup took place and you got yourself killed but so what? You'd really rather not remember boinking that Jessica Chobot thing anyway so it's all good.
Shepard backs himself up just before the final battle on earth, does a pratfall whilst trying to dodge Habinger's laser pointer. Gets singed, goes loopy, does some stupid things with a toddler, dies...Oops. OK, fire up the backup and reassemble a new Shepard before the whole laser pointer pratfall nonsense and go again.
There has actually been talk in scientific circles TODAY (20th/21st century) about this sort of tech. No WAY they don't actually have it by ME days. Next time Liara goes on and on and on about how many thousands of years she has lived and will live, Shepard can yawn and say, "Yeah? Me too. Want cake?"
Wong isn't actually PERMANENTLY dead, she's just lost any memories and experiences she had since her last nano backup. Good as new.