i don't oppose to full album streams. but neither am i of the opinion that all albums should be made available for streaming..
what i do
think is that most money in the music industry is and will be made from shows and licensing, and from that perspective a full album stream cleary has an advantage over any 2 track preview or less. so in my humble opinion, performing artists & bands - especially those who have a big enough audience to warrant frequent touring - should and will make their latest album available for streaming. i think that's unstoppable, money is always an important motivator. it's an "industry" afterall ...
obviously there are always ifs and buts. a band like sonic youth won't benefit from a full album stream, i doubt album sales would benefit from a full album stream (unless it's an unknown band), ...
too me it does say a lot more than a few snippets. maybe i'm already used to full album streaming, as in the netherlands you have "luisterpaal" a website that always streams about 20 new releases. (legally!) (
http://3voor12.vpro.nl/luisterpaal/) right now including four tet, jaga jazzist, lindstrom, richard skelton, ... at work I always go through most of the releases available, just playing an entire record instead of a few songs.