Personally I think heavy support teams are seeing too much play at the 500-1,500 MMR level in lieu of the patches to Blade Mail. The new Jungle seems to heavily favor team compositions without much support, however, so as players adapt I wouldn't be surprised to see some stronger tri-lane compositions. I haven't had much opportunity to explore Alchemist in the new setting, but Brewmaster seems to have been overlooked in the talent trees while other heroes are doing well.
Thanks for reading.