More people should dodge, not less. It's inconsiderate to NOT dodge when you can tell just from champ select that a game is going to be a disaster.
Losing 5 minutes for a lobby isn't a big deal compared to the 20 minute stompfest you were about to have to endure.
Example - I'll almost always dodge(As a Diana main) if I see the enemy with 3 tanks, a strong mid, and a strong ADC - Vs our Teemo/Sona/Diana/Kha/Ashe.
I'll also almost always dodge if a teammate is overly toxic in champ select. Trying to tilt your own team before the game even starts is ridiculous. The maturity level around here causes it to happen way more often than it ever should.
I'm not saying dodge all the time, but using up that first dodge of the day(5 minute timer, -3 LP) is always advisable over playing a full losing game(-20+ mins, -15+ LP)