i can't think of a good reason to get team mates that should be taking bot to actually go bot for the first few minutes of the game other than 'we will lose the node if nobody goes bot' and that usually ends with 'you go bot.'
well i'm sorry kassadin, i am xin zhao and i think i would be better at top than you would at level 3. nobody ever wants to take bot, there is no reason to take a solo lane for dominion. other than farm, but nobody wants that because you get spoon fed your items anyways on dominion. i myself am perfectly fine with going bot in pug games because i know most of the time i won't lose the lane, but when i see a character on the char select screen that would be better bottom, i'd assume they'd take it.
the problem lies in the scoreboard. people play this game to have fun, and that usually means highest score for most players, everybody wants to be on top of the scoreboard. another example would be for people who have played world of warcraft. i know you've had those games of warsong gultch, or arathi basin where you've either had a group of players fighting mid, or graveyard camping, yet you know that team has like two or three people running to your base, grabbing your flag and capping, causing you to lose the game, but the perfect example would be arathi considering the game modes are very similar. anyways, back to the problem. people want to be on the top of the boards, and in the bottom lane that rarely happens considering it is a 1v1 most of the time because the teams are fighting else where, you'll have the rare gank attempts that come bot but after the spot is either lost, or defended you're left to defend bot alone again. if you try to leave the lane, nobody else will cover it, so you don't leave.
most of the time i am left defending the bottom lane because nobody else will do it. i don't mind 1v1ing, or the fact i'm bottom of the boards due to defending that tower, because we can win the game from defending that tower, but when i pick a character that would be better suited top, or when i see a character that would be better suited bottom, i get annoyed when that player doesn't want to go where he should be, because it's boring. i've had so many games where i've had to lane bot as a character with terrible farm while laning against something like heimer while we have very weak characters running top because they think bot is boring, so we not only end up losing top, but bot as well because after we lose top, people are too concerned with throwing themselves into the enemy team endlessly up top instead of helping bot while he is getting crushed by a heimer with promote, and that usually throws the game right from the start, because the same bad players that should have been bot want to give up because they don't do enough damage and end up getting stomped.
now that i read this post to myself, i guess my problem is bad players.. this is more of just a rant i guess.