I have not compared enough streamers to really say how fast they are evolving, this is more based on what I've read.
I think streamers may improve a bit more but the biggest change will be the trickle down effect, cheap streamers a few years from now will probably sound closer to the expensive streamers of today. The manufacturers already know that good clocks help, good power supply helps, lowering electrical interference helps and so on. When they sell more the parts will go down in price and they won't need as much R&D as now.
So, a $5k streamer may be a risky purchase today because in 3 years there might be equally good streamers for $2.5k.
I think streamers may improve a bit more but the biggest change will be the trickle down effect, cheap streamers a few years from now will probably sound closer to the expensive streamers of today. The manufacturers already know that good clocks help, good power supply helps, lowering electrical interference helps and so on. When they sell more the parts will go down in price and they won't need as much R&D as now.
So, a $5k streamer may be a risky purchase today because in 3 years there might be equally good streamers for $2.5k.