I plan on getting and playing DotA 2.
I do not intend to stop playing LoL.
LoL had over 100k viewers during much of their season 1 finals streams (which occurred in the dead of night on account of being hosted in Sweden). It will be interesting to see if DotA 2 streams can compete with those numbers.
In any case I will play both games. By switching to LoL (from DotA) I was able to stay sharp in a community that is still growing and competitive (which DotA no longer was). I expect I will take to DotA2 pretty well.
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Eff_Dee
http://img.imgcake.com/nio/9fdpngys.png